To Sygyzy, bral, BBK, Baron Buzz and cavortingcheetah, thank you for your posts and info. And alos thank you to those that PM'd me. Have sent off messages to the mentioned organisations.
Cavort due you mean as in a Grace and Favour home? Of course if the politicians can get away with that it means I probably can't! As you mentioned on another thread, we do not really have a tax constitution in the UK. My old company had a pilot who took HMRC to court after they reached an agreement on the tax break on fixed rate expense allowances and then renaged on the deal. Although effectively the case went in the pilots favour the Judge ruled that it was not in the countries interest that a lot of back tax should be paid. It did lead to a universal fixed rate expense allowance amongst the airlines rather than a rate agreed with the local tax office where the particular airline had its tax affairs based.