CliffordFW:
1: Don't know about Cambridge but did my IMCr last month and used Southend, I think it was £18 per NDB/ILS approach. (might be that plus VAT - can't recall).
2: TT Vol 5 is very good, also get the IMC confuser too to back this up and make the exam easy. Most of the exam by the way is a flight plan/PLOG affair so brush up your planning and dust off/practice with your whizz wheel if rusty!
Good luck with your IMC, it's not as easy as people (usually those who've never done it....) will have you believe but is very rewarding and your general flying will improve too (accuracy etc).