Sounds about right - education ain't cheap I'm afraid. Unless you qualify for some kind of grant, I'd be surprised if you get a Masters qualification anywhere that is much cheaper.
The best known distance-learning training provider in the UK is the
Open University but I'm afraid that they don't do aeronautics - and of-course they want you on campus for short periods. You really think anybody can award a degree of that level without some direct contact and lab-time? That said, it *may* be that they can form some arrangement with a local university in that regard.
American universities can offer distance learning without time on campus because they are fairly unique in the western world now in their degree education - it is based upon learning and repetition, rather than learning to do and think. The former can be done without direct contact, the latter is impossible.
G