Since 1997, every new government has been defined by an inner-London postcode. Remember the David Cameron era ‘Notting Hill set?’ Tony Blair’s ‘Granita summit’ in 1994 with Gordon Brown and the frequently elicited mockery about the ‘Islington elite?’ Even Liz Truss lasted just long enough for a headline or two about her ‘Greenwich gang,’ which included her chancellor Kwasi Kwarteng.