Just a brief update - I did as Dean suggested and now have a copy of the invoice which says "fitted the outer cv boot - also had to change the inner cv boot - had to put in 3 litres of gear box
parts: kit gaitor £15.12
gaiter d/shaft £28.22
grand total £213.78.
I'm advised that any MOT appeal inspections have to take place within a month for parts and three months for bodywork stuff.
But I'm writing to the Vehicle Operator Service Agency anyway to see if there's any chance of an independent inspection.
Thanks for all the input, guys. My memory turned out to be very hazy (doh!) but the size of the final total was substantial enough to remain in my memory!! ;-)