thanks for the comments guys!
airic - it was actually raining all around manchester - except the airport - very weird... my g/f was about 10 miles away and said she was getting drenched!
plasticspanner - there is an aviation viewing area which is right next to one of the run ways - its £3 to go in - but you can stay all day (should u want to!). They have concorde there too which on certain days I believe you can go on a guided tour. It's not bad actually - it is always busy at weekends. PEople take their kids who are clearly not interested in being there!! Other than shouting "Look mummy there's a really big one taking off" then crying when it's too noisy.... wonderful!