In an unusual move, the Energy Secretary – a committed opponent of oil and gas – has told regulators not to approve a new round of drilling that was slated for confirmation in the coming weeks.

It means companies have potentially wasted millions on preparing their bids, with experts warning legal action is likely.

The decision follows crisis meetings held this week between Miliband and his aides after questions were asked by journalists about outstanding drilling applications.

Applications were submitted by 76 oil and gas companies as part of the 33rd offshore oil and gas licensing round initiated by the last government in autumn 2023.

Bids for up to 35 areas of the North Sea were still awaiting a decision from the North Sea Transition Authority (NSTA) when the election was called.

In a statement late on Wednesday, Miliband's spokesman said: “We will not issue new licences to explore new fields, and will not revoke existing oil and gas licences. We will manage existing fields for the entirety of their lifespan.”

Labour has appointed one of the country’s foremost climate experts to lead a “mission control centre” on clean energy.

Chris Stark, the former head of the UK’s climate watchdog, will head a Covid vaccine-style taskforce aimed at delivering clean and cheaper power by 2030.

The Department for Energy Security and Net Zero said the centre would work with energy companies and regulators and would be the first of its kind in Whitehall, following Keir Starmer’s plan for mission-driven government.

According to this model, ministers will focus on tackling five of the biggest challenges facing the country, one of which is clean energy.

Stark said: “Tackling the climate crisis and accelerating the transition to clean power is the country’s biggest challenge, and its greatest opportunity. By taking action now, we can put the UK at the forefront of the global race to net zero.”