I used a lady called Cathy Collier who operates near Reading. She was very reliable and did an excellent job. T&K marina will have her contact details.
I also used Jeckells for some upholstery work which was good. My wife was not quite so happy with the curtains they did, but I think she was just being fussy. When we contacted them subsequently about a canopy they said they were no longer taking on work in our area. It may have being a polite way of saying they thought we were too fussy.
I had trouble getting Jeckells to take amy interest (T&K too) so ended up with Sparks Marine Trimmers between Thame and Aylesbury. Very pleased with the outcome - not cheap though!
You could also try Colin at Mac Hoods based in Cookham. We have used him on numerous occasions and his work is A1. Very busy man though so you may have to wait a while.