Short of an independent panel made up of people with no axes to grind
it would be difficult to set up an aceptable expenses policy.
For people who never work on expenses then often the whole notion is often seen as a jolly.
If you do travel on expenses then you know that a paper and cup of tea at an airport every other day soon adds up, and if you werent on works business then you woudlnt be spending it, so its only fair you get it back.

My own solution would be Crown owned flats in london for each elected palimentarian with electricity, gas, broadband etc all paid for and a fixed 'days in residence' food budget linked to a 'signing in' process for parliment or other official work. Travel expenses from constituency to London would be paid based on the signing in policy.
If you weren't in residence then no expenses.

Peronalised plates such as th3d15c0k1ngp1n i.e 1337 sp33k are a bit naff, but I can understand why people might want non-age related plates on a newer car if they are of the keeping up with the Joneses persuasion.
(thediscokingpin, Mon 11 May 2009, 14:13, archived)