September is the month the British new-car market is built around — one of two plate changes in the year — and in 2026 it produced the country's biggest month for battery-electric cars on record. Preliminary SMMT figures put BEV registrations at 99,199, up 36.3% year on year, on a total market of 350,518 cars.
That is a 28.3% battery-electric share, and a 12.1% rise in the overall market: the tenth consecutive month of growth and the strongest September since 2017.
The month in figures
| Measure | September 2026 | Change |
|---|---|---|
| Total new car registrations | 350,518 | up 12.1% |
| Battery-electric registrations | 99,199 | up 36.3% |
| BEV share of the market | 28.3% | record monthly volume |
| BEV registrations, January to September | 454,945 | up 30.2% |
| BEV share, year to date | 26.2% | 20.2% at the same point in 2025 |
Tesla took the top spot
The Model 3 was the best-selling battery-electric car of the month with 9,929 registrations — not the best-selling Tesla, the best-selling EV of any brand. The Model Y followed in second, giving Tesla both of the top two places, with the BYD Sealion 7, the BYD Seal and the Kia EV3 behind them.
That is a different shape from the one we recorded in July, when the UK hit a then-record 27.5% share, and it is worth noting which cars are doing the chasing: two of the five best-selling EVs in Britain last month were BYDs.
The mandate gap is the part that gets dropped
The ZEV mandate requires 33% of a manufacturer's cars to be zero-emission in 2026. The year-to-date figure is 26.2%. On the headline numbers Britain is running about seven percentage points short with one quarter to go, and a record September has not closed that.
But the headline target is not what manufacturers are actually judged against, and this is the detail that tends to vanish from the coverage. Flexibilities negotiated into the scheme and running until 2027 let carmakers comply by cutting CO2 from their petrol and diesel sales, by borrowing credits against future years, and by buying credits from other manufacturers. Carbon Brief's reading is that the 33% headline can be met with real EV sales nearer 25%. On that basis September's 28.3% is comfortably compliant, and the gap the industry cites in its lobbying for an early review is a gap against a number nobody has to hit.
What it means for a European buyer
Britain is not in the EU's regulatory system, but it is the same right-hand-drive and left-hand-drive supply pool, and a record month there competes for the same cars. For a Tesla buyer the signal is narrower and clearer: in the month Britain bought more electric cars than it ever has, the single car it bought most of was a Model 3 — at a point when Tesla's global quarter was down 2.1% year on year. Europe is not where that decline is coming from.