Take a look at NAIA naiasc.com, It's not in the UK it is in South Carolina. I did my A&P in two weeks there, you will need a letter from your employer and the CAA, but I can't remember having to pay £85 to the FAA. THe first week you do practise exams revise the weak points, the second week you do your Oral and Practical, I was one on one with an instructor, the biggest class I have heard of there is around four guys.