Sloany,
At the flying school where I work at Exeter, our rates per hour are:
C150: £100 - £4 landing
C172: £112 - £5 landing
if you would like I can forward our info pack by email to your address - the information would be fairly standard wherever you go, so it may be helpful.
For what it's worth, I think you have gone for a good route before your BA FB - I reached that stage last November, but didn't pass - i believe because I only had one hour of flying experience two years previously.
However I can't be sure because BA didn't give me any feedback, saying they didn't have the resources...ummm.