I tend to agree with Darryn here. My preference is to get a sail locally from Peter. But I know damn well that if I do that, then I am probably up for another one in order to fine tune the first, which I guess is no real big deal. Once done, however, then at least I would know that future sails should be easy to replicate.
There is a distinct advantage of buying a sail from a proven and popular sailmaker with a turnover of class sails. Even if it is not truly customised, at least you know that it is going to be around the ball-park.
Without publicly naming names, I bought a sail from a Victorian sailmaker a few years ago. Unfortunately, from when I got it, I could not get the top third of the tell-tails to flow going upwind. They were all over the place. The sailmaker didn't want to know about it. I have since asked Peter to straighten the luff curve and finally it is doing almost what it should.
You are lucky to live so close to all facilities!
Cheers