I know Martyn and use him for all my double bass repair/set ups. His work is amazing and is fairly priced. I have lots of luthiers nearer me but have realised that it's always worth making the effort to travel to his workshop.
I wanted to let you guys know a bit more about his basses.
http://www.mjbl.co.uk/index.php?opti...ments&Itemid=7
I've played 2 and the quality of workmanship and attention to detail is fantastic. The notes just fall under your fingers as the playability and his 'set ups' are superb. The quality of sound is also superb.