Minding my own business at 67 Pall Mall — the private members’ club favoured by oenophile West End hedge-fund managers that will serve as this week’s restaurant tip — I’m watching two tieless but well-tailored gents at the next table sampling different vintages of Château Pichon Longueville. And I’m thinking: ‘Bastards! These must be the friends-of-Boris who are conspiring to reap billions from a no-deal Brexit!’

It was former chancellor Philip Hammond who wrote recently of Johnson being ‘backed by speculators’, citing the PM’s sister Rachel who had spoken of the influence on him of ‘people who have invested billions in...