Labour under Jeremy Corbyn never misses an opportunity to miss an opportunity. The Panama Papers are a case in point.

Never interrupt your enemy when he is making a mistake. When the Prime Minister is about to make his seventh statement in seven days on his own finances, this is surely the time to sit back and relax, enjoying as one more full, frank and final explanation is followed by another.

There is no way, surely, to let Cameron off the hook? Of course there is! Never underestimate the tin ear of Labour's leadership.

The latest revelation - that David Cameron's mum gave him £200,000, has prompted John McDonnell, Labour's Shadow Chancellor, to launch a debate on inheritance tax. And with one bound, the Prime Minister is set free.

Cameron has a single transferable attack to make on Labour - you just don't understand Britain: you want to stop families looking after their children.