Questions that MPs dread
Every receipt from every claim by every MP for four years made under a system which all parties now agree was not only open to abuse but all too often encouraged it.
The Commons has been bracing itself for this ever since they lost a battle in the courts to prevent publication under Freedom of Information legislation. What they were not ready for was a leak of every detail to a newspaper, probably in return for a large sum of money.
What ministers call "inadvertent mistakes" others will describe much less charitably. What they say was "within the rules" others will call plain greedy. This will damage not just them and the government but the reputation of politics as a whole.
Neverthless, what's been revealed so far looks unlilkely to force anyone from office and compared with allegations of fraud that politicians have faced in many other countries this would be regarded as small beer.
Ask any MP and they'll insist that you don't get rich by going into politics. They'll tell you that they need to live in two places to do their job properly and that costs money which they're entitled to re-claim.
Tonight some are facing very awkward questions indeed and others - in all parties and at all levels - fear that they may be next.