Ged Green has already been mentioned. Paul Cuthbert of Paulcuthbert Guitars is excellent, he is in Whalley Range in Manchester.http://paulcuthbertguitars.co.uk/. He's away teching for a Swedish band for about another week.
Steve Lally of SJL Instrument Repairs in Stockport has worked on a few damaged lowdens, http://www.instrument-repair-manchester.co.uk/service/guitar-repair-stockport/