My company was singled out about 15 months ago and a small number of crews had to provide receipts for expenses incurred while away from base. I found it relatively easy to spend the required amount, what with the charges made for room service and Airport Hotel restaurants. The threat was that they were going to remove all our tax free allowance, all of 25%! Not heard anything back since. This is done by individual tax offices, though it seems from this thread there is a concerted effort going on. They will have to get their act together as there is a clause in the tax law somewhere that no one can be treated differently from someone else, which means that as long as some tax office is allowing a tax free element of allowances you can appeal on the grounds that you are being treated differently.