As others have said, Bonus is a good flying school! I've flown a few hours in their 2 C150's.
Thomson flying club is now called Azure flying club. They are worth a visit aswell. A friend of mine (that is also cranfield ATC) works there and speaks highly of them.
Whoever you chose to fly with I wish you good luck with your training. I enjoy flying from Cranfield and there are certainly some nice people to meet there.
