Conor Burns’s defence of the PM’s lockdown birthday party – that he was “ambushed with a cake” – may have received a Twitter ribbing, including from Nigella herself, though it’s hardly the most unbelievable claim. The PM himself was once caught on camera in exactly such a situation back on Peston’s show in 2016. At the time he’d been facing a barrage over his “have cake and eat it” quote regarding Brexit. Who ambushed the then-foreign secretary with the cake? None other than Robert Peston’s co-presenter, Allegra Stratton…