Chris Packham has filed a high court legal challenge to the UK government over its decision to weaken key climate policies. The broadcaster and environmental campaigner has applied for a judicial review of the government’s decision to ditch the timetable for phasing out petrol and diesel powered cars and vans, gas boilers, off-grid fossil fuel domestic heating and minimum energy ratings for homes. A Department for Energy Security and Net Zero spokesperson said it rejected Packham’s claims and would “robustly” defend the challenge. The measures and their schedule had been set out in the government’s carbon budget delivery plan, which was put before parliament in March this year. In September, Rishi Sunak announced he would delay the ban on selling new diesel and petrol cars from 2030 to 2035 and that 20% of households would be exempt from a new gas boiler ban among other changes, arguing that he did not want to burden ordinary people with the costs. Following the announcement, Packham wrote to Sunak, the energy secretary and the transport secretary to challenge the decision, arguing that the prime minister did not have the legal right to change the timeline of carbon budget pledges at will, since the actioning of the carbon budget delivery plan was governed by statute. Packham said he did not receive a satisfactory response to his letter and therefore filed the judicial review application. He added that the government’s response to his letter made clear that the decision was made without any public consultation, without informing the climate change committeeor parliament and without providing any reasons for the delays to the policies. The grounds for his judicial review include obligations under the Climate Change Act, he said. The legal challenge cites the requirement to have plans in place to meet the budgets if the proposals and policies within them are altered. Packham argues that the secretaries of state have breached this obligation by not confirming or outlining how they still intend to meet the latest budget. The legal challenge also alleges that there was a failure to consult on the changes, particularly a failure to take into account ongoing consultations about off-grid heating and minimum energy efficiency in rental properties. Rowan Smith, a solicitor at Leigh Day, said: “If the government’s lawyers are correct, then the secretary of state would have carte blanche to rip up climate change policy at the drop of the hat, without any repercussions whatsoever. “That’s why this legal challenge is so important: if successful, it will mean that the secretary of state has to keep to their promises to have in place policies that will enable carbon budgets to be met.” The application follows a successful legal challenge by Friends of the Earth that the 2021 sixth carbon budget did not include sufficient detail in order to demonstrate how the UK would reach net zero by 2050, as the Climate Change Act 2008 says it must. A spokesperson for the Department for Energy Security and Net Zero said: “We strongly reject these claims and will be robustly defending this challenge. We have overdelivered on every carbon budget to date and these changes keep us on track to meet our legal net zero commitments. We routinely publish future emissions projections across all sectors and will continue to do so.”