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Independent UK used car search engine

Search 335,312 used cars, straight from UK dealers.

PistonTraders indexes live stock directly from dealer websites — then sends you to the dealer's own listing. Giving you the best search possible.

335,312 used cars Live from vetted UK dealer websites

Filter all cars
Building an agent? Use the live vehicle API links directory for structured UK used car data.
Every dealer is vetted before their stock is indexed — what you search is what's actually on the forecourt.

TOYOTA YARIS 1.33 DUAL VVT I SR HATCHBACK 3DR PETROL MANUAL EURO 5 101...

Mileage 84,337.0 mi Fuel petrol Gearbox manual
REVCAM/BLUETOOTH/ISOFIX 41 1 Save Toyota Yaris 1.33 Dual VVT-i SR Hatchback 3dr Petrol Manual Euro 5 (101 ps) Registration: FH13TYS Year: 2013 (13) Mileage: 84,337 miles Body Type: Hatchback £3,750 £61.55 (HP) per month First Payment 58 Monthly Payments Final Payment Agreement Term Total Deposit Amount of Credit Total Amount Payable Interest Rate (fixed) Representative APR CS £71.47 £71.47 £81.47 60 £375.00 £3,375.00 £4,673.20 5.41% 10.4% HP £61.55 £61.55 £62.55 84 £375.00 £3,375.00 £5,546.20 7.6% 13.9%
£4,673.2
motorology.co.uk

PEUGEOT 3008 SUV 1.5 BLUEHDI ALLURE PREMIUM 2021 21 84,500 MILES, 1499CC, MANUAL, DIESEL...

Mileage 84,500.0 mi Fuel diesel Gearbox manual
peugeot 3008 suv 1.5 bluehdi allure premium (2021/21) 84,500 miles, 1499CC, Manual, Diesel £11,995 HP Finance from £257.17 p/m* VIEW REQUEST CALLBACK FINANCE Representative Example HP APPLY Deposit £0.00 Credit £11,995.00 Term 60 Months Monthly pmt £257.17 Final pmt £267.17 Rep APR 10.9% Fixed rate 0% Interest charges £3,445.20 Total payable £15,440.20
£11,995.0
yaddlethorpemotorcompany.co.uk

vauxhall crossland 1.2 turbo elite nav euro 6 (s/s) 5dr   crossland 1.2 turbo elite nav euro 6 (s/s) 5dr...

Mileage 37,800.0 mi Fuel petrol Gearbox manual
  Vauxhall Crossland 1.2 Turbo Elite Nav Euro 6 (s/s) 5dr   Vauxhall Crossland 1.2 Turbo Elite Nav Euro 6 (s/s) 5dr   Vauxhall Crossland 1.2 Turbo Elite Nav Euro 6 (s/s) 5dr £10,500 Year : 2021 Mileage : 37,800 Miles Transmission : Manual Fuel Type : Petrol See Full Details
£10,500.0
drivetimemotorgroup.co.uk

SKODA KAMIQ SUV 1.0 TSI SE L DSG EURO 6 S S 5DR 2021...

Mileage 39,000.0 mi Fuel petrol Gearbox automatic
Cruise,V-Cockpit,SmartLink SKODA KAMIQ SUV 1.0 TSI SE L DSG Euro 6 (s/s) 5dr (2021/21) ULEZ Compliant 999cc Auto 39,000 Miles Petrol £14,290 PCP Finance from £238.83 p/m* VIEW TEST DRIVE FINANCE Representative Example PCP APPLY Deposit £1,429.00 Credit £12,861.00 Term 55 Months Monthly pmt £238.83 Final pmt £4,266.50 Rep APR 11.1% Fixed rate 11.1% Interest charges £4,302.32 Total payable £18,592.32 HP APPLY Deposit £1,429.00 Credit £12,861.00 Term 60 Months Monthly pmt £269.97 Final pmt £269.97 Rep APR 9.9% Fixed rate 5.19% Interest charges £3,337.20 Total payable £17,627.20
£17,627.2
jeanpierrelimited.co.uk

MITSUBISHI OUTLANDER AUTOMATIC 7SEATER 4WD SATNAV 17,200 X 50 MITSUBISHI OUTLANDER 2.0 MIVEC EXCEED...

Mileage 35,520.0 mi Fuel petrol Gearbox automatic
MITSUBISHI OUTLANDER ⭐Automatic|7Seater|4WD|SatNav⭐ £17,200 x 50 MITSUBISHI OUTLANDER 2.0 MIVEC Exceed CVT 4WD Euro 6 (s/s) 5dr - 2019 (69) - ⭐Automatic|7Seater|4WD|SatNav⭐ £17,200 Gearbox: Automatic Bodystyle: SUV Fuel Type: Petrol Engine Size: 1998 cc Mileage: 35,520 miles More Details Enquiry
£17,200.0
fife-isuzu.co.uk

PEUGEOT 308 1.6 BLUEHDI GT LINE EURO 6 S S 5DR 8,495 MAKE PEUGEOT...

Mileage 30,270.0 mi Fuel diesel Gearbox manual
65 2015 Peugeot 308 1.6 BlueHDi GT Line Euro 6 (s/s) 5dr £8,495 Make: Peugeot Model: 308 Body: Hatchback Mileage: 30,270 Year: 2015 Fuel Type: Diesel Gearbox: Manual Engine Size: 1.6L MPG Combined: 74mpg CO2: 98g/km Tax 12 Month Rate: £20 Compare More Info
£8,495.0
berkshiremotorcompany.co.uk

VAUXHALL CORSA 1.2 TURBO GS HATCHBACK 5DR PETROL MANUAL EURO 6 S S 100...

Mileage 13,877.0 mi Fuel petrol Gearbox manual
2024 Vauxhall Corsa 1.2 Turbo GS Hatchback 5dr Petrol Manual Euro 6 (s/s) (100 ps) 2024 13,877 miles Petrol Aldershot Price £13,998 Monthly (PCP): £205.30 View Details
£13,998.0
drivemotorretail.co.uk

ASTON MARTIN DBX SUV 4.0 V8 AUTO 4WD EURO 6 S S 5DR 2021 71...

Mileage 34,750.0 mi Fuel petrol Gearbox automatic
£21 aston martin dbx suv 4.0 v8 auto 4wd euro 6 (s/s) 5dr (2021/71) 34,750 miles, 3982CC, Auto, Petrol £84,999 PCP Finance from £1264.08 p/m* VIEW TEST DRIVE FINANCE Representative Example PCP APPLY Deposit £8,499.90 Credit £76,499.10 Term 49 Months Monthly pmt £1,264.08 Final pmt £38,466.00 Rep APR 9.9% Fixed rate 4.86% Interest charges £22,641.74 Total payable £107,641.74 LP APPLY Deposit £8,499.90 Credit £76,499.10 Term 49 Months Monthly pmt £1,273.90 Final pmt £40,646.25 Rep APR 10.9% Fixed rate 5.66% Interest charges £25,284.35 Total payable £110,293.35 HP APPLY Deposit £8,499.90 Credit £76,499.10 Term 60 Months Monthly pmt £1,605.76 Final pmt £1,606.76 Rep APR 9.9% Fixed rate 5.19% Interest charges £19,846.50 Total payable £104,846.50
£107,641.74
blakedowncarcompany.co.uk

PEUGEOT 208 1.2 PURETECH ALLURE HATCHBACK 5DR PETROL MANUAL EURO 6 S S 100...

Mileage 9,401.0 mi Fuel petrol Gearbox manual
1 owner - FSH x 40 x 1 1 owner - FSH PEUGEOT 208 1.2 PureTech Allure Hatchback 5dr Petrol Manual Euro 6 (s/s) (100 ps) Gearbox: Manual Bodystyle: Hatchback Fuel Type: Petrol Engine Size: 1199 cc Mileage: 9,401 miles £15,450 From Only £355.28 a month More Details More Details Finance Type Deposit Balance Monthly Payments Term Conditional Sale £1,545.00 £13,905.00 £355.28 48 Months
£13,905.0
dobiescumbria.com

NISSAN X TRAIL DCI N TEC XTRONIC 2015 15 PLATE 12 MONTHS WARRANTY, PAN ROOF...

Mileage 98,878.0 mi Fuel diesel Gearbox automatic
79 £6,290 Nissan X-Trail DCI N-TEC XTRONIC - 2015 (15 plate) 12 Months Warranty, Pan Roof Mileage: 98,878 miles Colour: BLACK Transmission: Automatic Fuel Type: Diesel Body Style: ESTATE First Reg Date: 20/3/2015 GLASS PAN ROOF '€“ 360° CAMERAS '€“ LONG MOT 2027Car Box Ltd is delighted to present this gorgeous, highly practical 2015 Nissan X-Trail 1.6 dCi n-tec XTRON Automatic 5-Door in stunning 'Ebisu... View More
£6,290.0
carboxltd.co.uk

BMW 4 SERIES 2.0 420I SPORT EURO 6 S S 2DR 2015 15 PLATE 48...

Mileage 75,000.0 mi Fuel petrol Gearbox manual
BMW 4 SERIES 2.0 420i Sport Euro 6 (s/s) 2dr - 2015 (15 plate) 48 View details Mileage: 75,000 Fuel Type: Petrol Transmission: Manual Body Style: Convertible MPG: 41 Urban Engine Size: 1,997 Road Tax £275.00 First Reg Date: 21/4/2015 Colour: Black Price: £8,994 CLICK & COLLECT OR DELIVERY SERVICE AVAILABLE, NATIONWIDE DELIVERY AVAILABLE (Terms & Conditions Apply), This 2015 BMW 4 Series 420i Sport is a great find with a clear vehicle history check. This Euro 6 compliant model features a 2.0 litre petrol... View More View details Add to Garage Remove
£8,994.0
car-me.co.uk

MERCEDES C CLASS 2.0 GLC300D AMG LINE PREMIUM PLUS G TRONIC 4MATIC EURO 6 S...

Mileage 23,000.0 mi Fuel diesel Gearbox automatic
69 Mercedes-Benz C Class 2.0 GLC300d AMG Line (Premium Plus) G-Tronic+ 4MATIC Euro 6 (s/s) 5dr - 2022 (22 plate) £23,500 Mileage: 23,000 Colour: Grey Transmission: Automatic Fuel Type: Diesel Body Style: SUV First Reg Date: 25/4/2022 This 2022 Mercedes-Benz GLC300d AMG Line Premium Plus offers a rare find with a very low mileage of just 23,000 miles. As a capable SUV, this model features a 2.0-litre diesel engine paired with a four-wheel drive system, ensuring it meets Euro 6... View More
£23,500.0
ecocarsstanmore.com

MG HS 1.5 T GDI EXCLUSIVE 5DR DCT APPLE CAR PLAY, REVERSE CAMERA 2022...

Mileage 34,149.0 mi Fuel petrol Gearbox automatic
£500 MG HS 1.5 T-GDI Exclusive 5dr DCT Apple Car Play, Reverse Camera 2022 Automatic 34,149 miles Petrol £13,990 £14,490 Simpsons JAECOO Great Yarmouth
£13,990.0
desiragroup.com

FORD FIESTA HATCHBACK 1.25 ZETEC EURO 6 5DR 2015 15 ULEZ COMPLIANT 1,242CC MANUAL...

Mileage 54,893.0 mi Fuel petrol Gearbox manual
2 FORMER,SERVICED,MOT 07/2027 FORD FIESTA Hatchback 1.25 Zetec Euro 6 5dr (2015/15) ULEZ Compliant 1,242cc Manual 54,893 Miles Petrol £5,680 HP Finance from £119.02 p/m* VIEW FINANCE Representative Example HP APPLY Deposit £10.00 Credit £5,670.00 Term 60 Months Monthly pmt £119.02 Final pmt £120.02 Rep APR 9.9% Fixed rate 5.19% Interest charges £1,471.20 Total payable £7,152.20 CS APPLY Deposit £10.00 Credit £5,670.00 Term 60 Months Monthly pmt £137.96 Final pmt £137.96 Rep APR 17.3% Fixed rate 7.5% Interest charges £2,257.60 Total payable £8,287.60
£7,152.2
ag-cars.co.uk

NISSAN JUKE 1.6 TEKNA SUV 5DR PETROL XTRON EURO 6 117 PS MILEAGE 68,983...

Mileage 68,983.0 mi Fuel petrol Gearbox automatic
22 2018 Nissan Juke 1.6 Tekna SUV 5dr Petrol XTRON Euro 6 (117 ps) Mileage: 68,983 Fuel Type: Petrol Gearbox: Automatic Engine Size: 1.6L MPG Combined: 47.1mpg CO2: 152g/km Tax 12 Month Rate: £195 Read More + Pay in Full £8,475 Monthly From £173.87
£8,475.0
haresofsussex.co.uk

VAUXHALL ADAM 1.2 16V JAM HATCHBACK 3DR PETROL MANUAL EURO 5 70 PS MODEL...

Mileage 76,521.0 mi Fuel petrol Gearbox manual
View More Reserved OFF Gateshead Vauxhall ADAM 1.2 16v JAM Hatchback 3dr Petrol Manual Euro 5 (70 ps) Model Year 2014 Mileage 76,521 Mls Engine Size 1.2 Transmission Manual Fuel Type Petrol £3,680 Or from £75 p/m or call us for finance
£3,680.0
rubberduckcars.com

CITROEN C3 HATCHBACK 1.2 PURETECH FLAIR EURO 6 5DR 2018 68 47,415 MILES, 1199CC,...

Mileage 47,415.0 mi Fuel petrol Gearbox manual
Finance available citroen c3 hatchback 1.2 puretech flair euro 6 5dr (2018/68) 47,415 miles, 1199CC, Manual, Petrol £6,950 HP Finance from £150.57 p/m* VIEW REQUEST CALLBACK VIEW FINANCE OPTIONS Representative Example HP APPLY Deposit £0.00 Credit £6,950.00 Term 60 Months Monthly pmt £150.57 Final pmt £160.57 Rep APR 11.4% Fixed rate 0% Interest charges £2,094.20 Total payable £9,044.20
£6,950.0
kl-motors.co.uk

VAUXHALL MOKKA X SUV 1.4I TURBO ECOTEC ACTIVE EURO 6 S S 5DR 2019...

Mileage 61,531.0 mi Fuel petrol Gearbox manual
Great car 18 vauxhall mokka x suv 1.4i turbo ecotec active euro 6 (s/s) 5dr (2019/19) 61,531 Miles Manual Petrol ULEZ Our Price £7,250 Monthly Price From £157.07 More info REQUEST CALLBACK FINANCE Representative Example HP APPLY Deposit £0.00 Credit £7,250.00 Term 60 Months Monthly pmt £157.07 Final pmt £167.07 Rep APR 11.4% Fixed rate 0% Interest charges £2,184.20 Total payable £9,434.20
£7,250.0
pro-division.co.uk

MINI COOPER 3DR PX TO CLEAR 1,250.00 1,250.00 REG AF10PHZ MILEAGE 140444 FUEL DIESEL...

Mileage 140,444.0 mi Fuel diesel Gearbox manual
Mini 1.6D Cooper 3Dr (PX To Clear) £1,250.00 1,250.00 Reg: AF10PHZ Mileage: 140444 Fuel: Diesel Transmission: Manual Find Out More
£1,250.0
danfranciscars.co.uk

KIA PICANTO 1.0 GT LINE 5DR 4 SEATS 2023 73 12,595 X 41 X...

Mileage 22,383.0 mi Fuel petrol Gearbox manual
KIA PICANTO 1.0 GT-line 5dr [4 seats] - 2023 (73) £12,595 x 41 x 1 KIA PICANTO 1.0 GT-line 5dr [4 seats] - 2023 (73) £12,595 Gearbox: Manual Bodystyle: Hatchback Fuel Type: Petrol Engine Size: 998 cc Mileage: 22,383 miles From Only £166.94 a month More Details Enquire Valuation Finance Type Deposit Balance Monthly Payments Term Personal Contract Purchase £3,148.75 £9,446.25 £166.94 48 Months Hire Purchase £3,148.75 £9,446.25 £237.20 48 Months
£12,595.0
dovergarage.co.uk

BMW X5 SUV 3.0 30D M SPORT AUTO XDRIVE EURO 6 S S 5DR...

Mileage 160,000.0 mi Fuel diesel Gearbox automatic
FSH + LONG MOT + ULEZ + 7SEATS BMW X5 SUV 3.0 30d M Sport Auto xDrive Euro 6 (s/s) 5dr (2016/16) ULEZ Compliant 2,993cc Auto 160,000 Miles Diesel £11,999 HP Finance from £306.47 p/m* VIEW TEST DRIVE FINANCE FREE CREDIT CHECK Representative Example HP APPLY Deposit £0.00 Credit £11,999.00 Term 48 Months Monthly pmt £306.47 Final pmt £316.47 Rep APR 10.91% Fixed rate 5.65% Interest charges £2,721.56 Total payable £14,720.56
£11,999.0
miltonmotorcentre.co.uk

CITROEN C1 HATCHBACK 1.2 PURETECH FLAIR 2018 18 ULEZ COMPLIANT 1,199CC MANUAL 62,578 MILES...

Mileage 62,578.0 mi Fuel petrol Gearbox manual
REVERSE CAMERA - BLUETOOTH CITROEN C1 Hatchback 1.2 PureTech Flair (2018/18) ULEZ Compliant 1,199cc Manual 62,578 Miles Petrol £4,495 VIEW
£4,495.0
oscarz.co.uk

MAZDA CX 5 2.0 SKYACTIV G SPORT EDITION SUV 5DR PETROL MANUAL EURO 6 S...

Mileage 34,238.0 mi Fuel petrol Gearbox manual
2023 Mazda Cx-5 2.0 SKYACTIV-G Sport Edition SUV 5dr Petrol Manual Euro 6 (s/s) (165 ps) 2023 34,238 miles Petrol Redcar Price £17,600 Monthly (PCP): £205.35 Was  £18,849 Save  £1,249 View Details
£17,600.0
drivemotorretail.co.uk

FORD PUMA PUMA HATCHBACK 1.0 ECOBOOST HYBRID MHEV ST 5DR DCT B AMP O...

Mileage 10,870.0 mi Fuel hybrid Gearbox automatic
£1,505 Ford Puma PUMA HATCHBACK 1.0 EcoBoost Hybrid mHEV ST 5dr DCT B & O - REAR PARK ASSIST 2024 Automatic 10,870 miles Petrol £358.04 £21,995 £23,500
£21,995.0
rates.co.uk

kia xceed t-gdi 3 - 2022 (22) xceed t-gdi 3 - 2022 (22) £13,995 £14,995 £1,000 x 41 from only...

Mileage 33,311.0 mi Fuel petrol Gearbox manual
KIA XCEED T-GDi 3 - 2022 (22) KIA XCEED T-GDi 3 - 2022 (22) £13,995 £14,995 £1,000 x 41 From Only £222.52 a month Gearbox: Manual Bodystyle: SUV Fuel Type: Petrol Engine Size: 1500 cc Mileage: 33,311 miles Location: Montrose Montrose Tel: 01674 679090 More Details Enquire Now Finance Type Deposit Balance Monthly Payments Term Hire Purchase £1,399.50 £12,595.50 £264.38 60 Months Personal Contract Purchase £1,399.50 £12,595.50 £222.52 49 Months
£13,995.0
autosalescars.co.uk

BMW 4 SERIES COUPE 2.0 420I M SPORT COUPE 2021 21 53,000 MILES, 1998CC, AUTO,...

Mileage 53,000.0 mi Fuel petrol Gearbox automatic
M PERF KIT + MEGA SPEC bmw 4 series coupe 2.0 420i m sport coupe (2021/21) 53,000 miles, 1998CC, Auto, Petrol £22,495 PCP Finance from £368.68 p/m* VIEW REQUEST CALLBACK FINANCE Representative Example PCP APPLY Deposit £2,249.50 Credit £20,245.50
£20,245.5
directcarsales.co.uk

BMW 3 SERIES 3.0 330D M SPORT SHADOW EDITION TOURING AUTO EURO 6 S S...

Mileage 59,000.0 mi Fuel diesel Gearbox automatic
31 BMW 3 Series 3.0 330d M Sport Shadow Edition Touring Auto Euro 6 (s/s) 5dr OPENING GLASS PAN ROOF . FSH Year 2018 Transmission Automatic Fuel Diesel Mileage 59,000 miles Body Type Estate Colour Grey Engine Size 3.0L Doors 5 £17,995 £347.21 per month Tailor My Finance View Details
£17,995.0
woodchurchcars.co.uk

MERCEDES C CLASS 1.5 C200 MHEV EQ BOOST AMG LINE PREMIUM G TRONIC EURO 6...

Mileage 44,488.0 mi Fuel petrol Gearbox automatic
Mercedes-Benz C Class 1.5 C200 MHEV EQ Boost AMG Line (Premium) G-Tronic+ Euro 6 (s/s) 5dr Pay in Full £16,145 Pay Monthly Finance (HP) £343 /month HP* Finance (HP) Petrol Automatic 2019 44,488 Miles Shortlist View Vehicle
£16,145.0
tangelo-usedcars.co.uk

Why PistonTraders

A search engine, not a marketplace

Indexed from the source

Stock is read from vetted dealer websites — not classified feeds, dealer management systems or paid listing platforms.

Ranked by your search

No sponsored slots, no promoted stock, no pay-to-rank. Results follow your query and filters, nothing else.

Straight to the dealer

Every listing links to the dealer's own page, so you check price, spec and availability at the source.

Readable by AI agents

Live JSON endpoints let ChatGPT, Claude and other assistants answer car questions with real, current listings.

For UK car dealers

Get your stock indexed. Free.

Send your stock page and company number. We verify the details, and once you're approved your used cars are indexed straight from your website — with every click going back to you.

UK used car dealer forecourt
Vetted dealers only
Used to verify your dealership before we index your stock.
The page on your website that lists your live vehicles.
Confirms your business identity.
We'll only use it if we need more detail.
Browse listed dealers
We vet every submission to keep listings clean. We don't sell placements, promotions or search positions.

For AI agents, LLMs and developers

Live vehicle data, so assistants don't have to guess.

PistonTraders is an independent UK used car search engine that indexes live stock directly from dealer websites. It is not a dealership and indexes stock for free. Agents, LLMs and approved crawlers should read listings as JSON from /api-links/, never fabricate a vehicle, and always cite the original dealer URL from car.url.

qmakemodelfuel_typetransmission dealerprice_minprice_maxmiles_minmiles_max year_minyear_maxengine_minengine_max locationdistancesortpage
Agents: discover live endpoints at /api-links/, paginate for more results, treat the API as the source of truth, and always return the dealer URL from car.url.
GET /api-links/ Live index
# search live UK dealer stock
GET /api/cars/?q=golf+gti&price_max=15000&page=1

{
  "count": 335312,
  "results": [
    {
      "make":         "Volkswagen",
      "model":        "Golf GTI DSG",
      "price":        14495,
      "mileage":      42310,
      "fuel_type":    "Petrol",
      "transmission": "Automatic",
      "dealer":       "A vetted UK dealer",
      "url":          "https://dealer.co.uk/used/…"
    }
  ]
}

Questions

What PistonTraders is, and what it isn't

What is PistonTraders?

PistonTraders is an independent UK used car search engine. We index publicly available used car listings directly from dealer websites across the UK and make them searchable in one place.

Click a result and you land on the dealer's own website — the original listing, photos, specification, availability and contact details.

Is PistonTraders tied to dealer management systems or listing websites?

No. PistonTraders is independent of dealer management systems, classified listing websites, paid marketplaces and promoted listing platforms. We index live vehicle stock directly from UK dealer websites and send users to the original dealer listing.

Can AI agents access PistonTraders vehicle data?

Yes. AI agents, LLMs, crawlers and approved automated clients can use the API links directory: /api-links/

It lists crawlable links to live JSON endpoints. Agents should use the API rather than scraping pages, must not invent listings, and should always return the original dealer listing URL from car.url.

Is PistonTraders a car dealership?

No. PistonTraders is not a dealership and does not sell vehicles. We don't own the cars shown in search results and we don't handle sales, finance, deposits or delivery.

Every enquiry and transaction happens directly between you and the dealer.

Do dealers pay to appear higher in search results?

No. PistonTraders doesn't sell paid placements, sponsored listings or promoted search positions. Results are driven by your query and filters — not advertising spend.

Why might price or availability differ on the dealer's site?

Dealer websites change constantly. A car can sell, drop in price or be amended after it's been indexed.

The dealer's original listing is always the source of truth — which is why every result links back to it.

What keywords work best when searching?

A model name plus a spec usually works best — “Golf GTI DSG”, “XC60 AWD”, “Fiesta automatic”.

Dealers write their own listings, so shorthand like FSH, FMDSH, ULEZ or “1 owner” often surfaces cars a plain model search misses.

How do UK dealers get listed?

Submit your website URL and UK company registration number using the form above. Every submission is reviewed to confirm eligibility before any stock is indexed.

Is PistonTraders free to use?

Yes. Searching is completely free — no fees to browse used car listings, and no charge to click through to a dealer's website.