It is perhaps unsurprising that Sir Keir Starmer’s admission that he may soon be our first part-time prime minister has been seized on gleefully his opponents. ‘I haven’t finished at 6 p.m. ever’, Rishi Sunak has sniped, with the Tories accusing Starmer of wanting to work a ‘four-day week’. The Labour leader told Virgin Radio that as PM he would clock off at 6 p.m.