1. Look after the pennies and the pounds take care of themselves. This truism has been proven particularly by the moat-and-swimming-pool Tories. They're worth millions and yet still file expenses forms for peanuts. It must be the habit that made them their piles.

2. Power corrupts. But you need to have the power. So, if you want to put the old adage to the test, there is never going to be a better time to stand as an MP. All you'll have to do to attack the incumbent is republish their receipts.

3. Democracy naturally tends towards mob rule. What Aristotle's thought misses out, though, is that in this case the mob turned out to be the rulers, not the ruled.

4. One bad apple does spoil a barrel. You've gotta feel for the MPs who haven't had their noses in it.

Any others?