More praise for these guys - I definitely recommend them if you are near Aylesbury.
I’ve been impressed with their friendliness when I’ve been there and, more importantly, I trust their work. They’ve recently replaced a few bits and bobs on my stead and given it an extremely thorough once over - thanks!
They also provide support for a few track riders (can’t remember who) and set up bikes for track days, so might be worth considering if that’s what floats your boat! 
They can be found at Unit 1, Masons Meadow, Aylesbury Road, Aston Clinton, HP225AH.