This is a genuine offer. I will pay £100 to any person who can provide a convincing reason why Denis MacShane’s expense fiddling, involving his creating false invoices, was not a criminal offence. Your argument does not have to be unanswerable – merely respectable. Up to three prizes will be given, for the three first and not essentially the same convincing arguments.

This competition specifically is open to employees of the Metropolitan Police and the Crown Prosecution Service; we would love to know their reasoning. It baffles me. I confess I can think of no single circumstance in this case that would prevent MacShane being convicted for theft and fraud. What is the answer?

Denis MacShane is a criminal. If he wants to try his chances with a jury, the libel courts are open to him and I am here.