Hi Mary,
The Jury's Inn is probably your best option. I looked long and hard for cheaper alternatives but fact is, it's probably as cheap as it gets especially if you would have to pay money for transport if you go a bit further away where it may be a bit cheaper.
If you buy over the online website you can book a room for £72. That's the cheapest. Even if you already work for another airline. Quite a chunk of money but I guess we'll all invest it in the hope that it'll pay off in the end....
Good luck!