According to the Tax Payers Alliance, in the fiscal year 2007/2008 13 out of 20 UK Government Departments spent over £18.5 million in flights.
(£10.6 million went on business and first class flights. But, when you include quangos and other bodies,the total bill for public sector flights was almost £70 million. I've never even been in first class, or business class, which is probably because so much of my income goes on taxes to pay for this.)