Bentley Derby Reliability, MOT Pass Rate & Common Faults
Free Bentley Derby car check
Is the Bentley Derby reliable? We analysed 699 real MOT tests across 117 vehicles to find out.
Got a specific Bentley Derby? Enter the reg for a free check:
The Bentley Derby is above average for reliability based on real UK MOT data. Common problems include brake recording little or no effort, tyre tread depth below requirements of 1.6mm and direction indicator not working. Here's everything you need to know before buying a used Bentley Derby.
Bentley Derby Number Plates
Number plates registered to a Bentley Derby. Click on any registration for full vehicle details — including MOT history, mileage records, previous owners and damage history.
Bentley Derby MOT Pass Rate by Year
How likely is a Bentley Derby to pass its MOT? Here's the pass rate for each registration year, newest first.
Bentley Derby Problems — What Goes Wrong?
The most common reasons a Bentley Derby fails its MOT, ranked by how often they occur. Check for these problems before you buy.
Bentley Derby Mileage — What's Normal?
How many miles does a typical Bentley Derby owner drive per year? Use this to check if a car you're looking at has suspiciously low or high mileage.
Bentley Derby MOT Data by Registration Year
Full breakdown of pass rate and mileage for each year. Use this to compare the Bentley Derby year you're looking at.
| Year | Tests | Pass Rate | Low Mi. | Typical Mi. | High Mi. |
|---|---|---|---|---|---|
| 1939 | 53 | 94.3% | 21,656 | 41,526 | 55,745 |
| 1937 | 85 | 92.9% | 10,768 | 28,598 | 75,606 |
| 1936 | 81 | 93.8% | 17,809 | 25,274 | 40,208 |
| 1935 | 117 | 90.6% | 33,260 | 53,962 | 74,256 |
| 1934 | 156 | 94.9% | 19,383 | 43,810 | 66,151 |
How Long Does a Bentley Derby Last?
Based on 117 Bentley Derby vehicles on UK roads.
Bentley Derby Mileage Distribution
Total mileage recorded across all Bentley Derby MOT tests. If the car you're looking at is above the 75th percentile, it's done more miles than most.
Best Year to Buy a Used Bentley Derby
Based on MOT pass rates across all registration years with sufficient test data.
94.9% MOT pass rate from 156 tests
90.6% MOT pass rate from 117 tests
The best year to buy a used Bentley Derby is 1934, which has the highest MOT pass rate at 94.9% across 156 tests. The 1935 model year has the lowest pass rate at 90.6% — if you're looking at one from that year, budget for potential repairs and get a thorough pre-purchase inspection.
How Does the Bentley Derby Compare?
MOT pass rates compared to similar models. Click any model for the full breakdown.
| Model | Pass Rate | Tests | Typical Mileage | Lifespan |
|---|---|---|---|---|
| Bentley Derby THIS CAR | 93.3% | 699 | 42,815 mi | 92 yrs |
| Bentley Continental | 90% | 209,069 | 37,776 mi | 29 yrs |
| Bentley Arnage | 85.9% | 40,970 | 45,703 mi | 28 yrs |
| Bentley Turbo | 78.7% | 31,416 | 73,541 mi | 41 yrs |
| Citroen Relay 35 L3H2 Enterprise HDI | 77.7% | 757 | 97,606 mi | — yrs |
Compared to the Bentley Continental (90.0% pass rate) and the Bentley Arnage (85.9% pass rate), the Bentley Derby outperforms both on MOT reliability.
Found a Bentley Derby you like?
Run a full vehicle history check on the specific car. See finance, stolen, write-off, mileage and MOT data for that exact vehicle.
Check a specific Bentley DerbyShould you buy a used Bentley Derby?
The Bentley Derby has an overall MOT pass rate of 93.3% across 699 real MOT tests — comfortably above the UK average, which puts it among the more reliable models on UK roads.
The most common problems on the Bentley Derby are brake recording little or no effort (6 recorded failures), tyre tread depth below requirements of 1.6mm (5), and direction indicator not working (4). These are the faults most likely to cause an MOT failure on this model, so check for them carefully on any test drive or pre-purchase inspection. Many are wear-and-tear items that can be budgeted for, but a car that's already failing on multiple fronts may signal neglected maintenance.
A typical Bentley Derby owner drives around 507 miles per year. If the car you're looking at is significantly above this, expect more wear on suspension, brakes and tyres. If it's well below, the vehicle may have been sitting unused — check for perished rubber, corroded discs and stale fluids.
In terms of longevity, most Bentley Derby models stay on UK roads for around 92 years — a strong showing that suggests solid build quality and readily available parts. If you're buying one that's already approaching that window, the data suggests it has plenty of life left provided it's been maintained.
Before committing to a purchase, we recommend running a full vehicle history check on the specific car. This will reveal any outstanding finance, stolen markers, write-off history and mileage discrepancies that the seller may not disclose — and that the MOT data alone can't tell you.