Can anyone recommend a supplier/custom manufacturer of tops/canvas in the Thames Valley or nearby area who could make up a top for a standard Bayliner 185?
Chris Harris of Harris Hoods made a custom canopy for my boat. He will do a great job for you, but based in Kidderminster where they build Trusty Boats. Chris does the canopies for them as well. Www.harrishoods.co.uk. Not local to your area, but I'm sure he will do a great job at fantastic value, as he does not need to cover Thames area overheads.
Not local but I've used these people before http://www.greatlakesboattop.com/bayliner . I think they make they original covers for most American boat builders. Mine was a perfect fit, original materials and cheaper than having one made locally.