The government has said it is stepping in to help the British car industry by making the rules on manufacturers going all-electric more flexible.

A ban on producing new petrol and diesel cars will come into effect in 2030, after ministers reinstated a deadline that had been pushed back by ex-Prime Minister Rishi Sunak.

However, on Sunday, Transport Secretary Heidi Alexander said that while the government is committed to the 2030 deadline, she would relax regulations which dictate how firms make the switch in order to “protect and create jobs”.

Opposition parties said the measures would not be enough to boost the industry, which faces an uncertain period after the US announced tariffs on cars.

President Donald Trump has imposed a 25% levy on cars imported to the US, which is a major export market for the UK motor industry.

While plans to phase out petrol and diesel vehicles pre-date the tariffs announcement, the government framed its latest intervention as a way to help car firms grow despite potentially seismic changes to the motor industry.

The government said it had worked with UK car manufacturers to simultaneously “strengthen its commitment to the phase out” while introducing “practical reforms to support industry meet this ambition”.

Under the current ­electric vehicle (EV) mandate, manufacturers are at risk of fines of £15,000 per car sold that does not meet the latest emissions standards.

Currently, 28% of new cars sold in the UK this year must be electric, a target that will rise each year until 2030.

But manufacturers will now be given more flexibility to balance the annual targets against each other and avoid fines by selling more EVs in later years of the mandate.

The announcement from the transport ministry said “support for the car industry will be kept under review as the impact of new tariffs become clear”.

The ban on sales of new petrol and diesel cars was extended to 2035 under the previous Conservative government, but Labour promised to restore the 2030 deadline in its manifesto for the 2024 election.

Car industry leaders have previously warned that drivers were not switching to electric vehicles at the rate needed to meet the deadline due to the cost of buying the cars privately and a lack of charging point infrastructure.

Writing in the Times newspaper, Prime Minister Sir Keir Starmer said the non-compliance fine will be reduced to £12,000, and people who want to purchase EV’s will be supported

“We’re putting £2.3 billion towards tax breaks for people buying electric vehicles and improving charging infrastructure,” he said.

The changes announced by the government include:

• Mandates imposed on car firms as they transition to phasing out petrol and diesel vehicle production will be relaxed to help firms avoid fines
• Smaller UK firms like Aston Martin and McLaren are to be allowed to keep making petrol cars beyond the 2030 deadline
• Some hybrid vehicles will be able to stay on the market until 2035

Sir Keir said the measures would “boost growth that puts money in working people’s pockets” and ensure “home-grown firms” can export UK-made cars worldwide.

But shadow business secretary Andrew Griffith described the measures as “half baked” and repeated Conservative leader Kemi Badenoch’s claim that “net zero by 2050 is impossible”.

Liberal Democrat transport spokesperson called for “better incentives” for consumers to buy electric vehicles, and said the changes “won’t be enough to protect the sector from the impact of Trump’s damaging tariffs”.

The US is the second largest export market for the UK’s car industry, after the European Union.

Coventry-based car manufacturer Jaguar Land Rover announced on Saturday that it will “pause” all shipments in April to the US as it works to “address the new trading terms”.

A separate 10% tariff on UK imports came into effect on Saturday, with higher rates in place for some other major economies.