Preferably Blackburn or Bolton. Thinking a lot of my knee pain stems from poor bike fit.

5ft 10 riding a Medium (18 inch) Cannondale Hardtail.

http://www.hewittcycles.co.uk/bike-fitting

Roadie fitters. No idea whether the same principles apply with mtb’s

Edit. I made an enquiry with my lbs the other week about bike fitting and they recommended these at manchester velodrome

Never used them but having read the website it looks like they deal specifically with cyclists with sports injuries

have a look at njd sports injury clinic in clitheroe

they’ve helped with my knee pain and will check your body out for underlying causes

Hewitts at Leyland get my vote