In the interview Cameron speaks very warmly of Boris and even floats the idea of Boris entering Number Ten...
Mr Cameron gave his most frank insights into his relationship with London's Mayor, insisting he is one of Boris Johnson's biggest fans but that the Mayor also “occasionally puts his size 10 feet in it”.
He admits Boris caused a problem by suggesting on the eve of the Tory party conference that they should have a referendum on Europe. “We managed to extinguish the fuse he lit. What it did not show was a deep split in the Conservative Party. It was more cock-up than division.”
Did Boris apologise? “I do not want to go into private conversations but all is well in the Dave/Boris relationship.”
Is the Mayor too much trouble? “Would I rather have some faceless bureaucrat running London who could not pull a crowd at the Tory conference? Or would I rather have a swashbuckling, charismatic, irresistible character who will, yes, occasionally put his size 10 feet in it? In the end I would rather have the latter.
“He is doing a fabulous job running London. I think what's happened in terms of security on public transport, trees, cutting waste, and the optimism and sense of dynamism he brings to the job, he is doing a fantastic job.”
Are they still on good terms? “We call each other, text each other, have dinner with each other's wives, we get on very well. It's a very good relationship — and a fun relationship. It's got a serious side, but it's light-hearted.” And when people say Boris should be in No 10? “Great! Good! I want people to look at the Conservative Party and say there is a huge amount of talent. It's not a one-man band, a two-man band, a three-man band.
“People who say what next for Boris?', I say the sky's the limit. He has got huge talent. I want the Conservative Party to have big figures in it.”
Perhaps the most revealing sentence, though, was this...
Unusually for a politician seeking to become Prime Minister in six months, he candidly admitted that his greatest driving force was the fear of making a mess. “Fear of getting things wrong inspires me more than the wonder of getting things right,” he said.
I suspect he is not alone in that. In fact, I know he isn't.