David Cameron left 10 Downing Street with indecent haste. Britain had voted for Brexit and we were about to discover a scandal: he had instructed the civil service not to do any preparatory work in the event of a Yes vote. This led to a crushed timetable that destabilised his successors as he ran for the door. Cameron then further broke the normal conventions of public service by resigning and forcing his constituents into a by-election rather than serving them for a full term as he promised. (Nadine Dorries is the only other MP in recent years to have bolted when her career headed south).

Cameron’s hiding from the public eye has meant he’s dodged many questions about his record. But now that he has come back into the arena, presumably giving interviews, here are some questions he should answer:

1. Brexit is the flagship foreign policy of the United Kingdom. Does he still oppose it?
2. If he cannot endorse Brexit, how can he expect the diplomats who work for him to do the same?
3. Does he back the Prime Minister’s foreign policy decision to cut state foreign donations to 0.5 per cent of GDP rather than 0.7 per cent?
4. Why did he ban preparatory work for a Brexit vote, and what effect did he think his decision had on his successors? Given that the UK prepares for all manner of highly unlikely contingencies, might this decision amount to misfeasance in public office?
5. How many governments around the world did he lobby on behalf of Greensill?
6. Can he list all financial rewards he has had from any foreign governments (or state-owned enterprises) since leaving office, including China?

There will be more questions to come – such as whether Sunak’s decision to appoint Cameron reinforces a ‘change’ or ‘timewarp’ message. Sunak really thinks none of his 350 MPs were fit to be Foreign Secretary – how will Cameron’s appointment go down with them?

Inviting a Prime Minister who quit with so many unanswered questions will open up another flank for Sunak to fight on. Mr S hopes he’s ready.