Sir Keir Starmer will announce plans to block all new North Sea oil and gas developments and limit borrowing to green investment only as part of a radical blueprint to make Britain a “clean energy superpower”. The Labour leader is expected to set out his net zero energy policy when he launches his latest “national mission” in Scotland next month. It will include a pledge to ban all new North Sea oil and gas licences, signalling a seismic shift in decades of UK energy policy. It will be one of