Hiya,
In case anyone is interested I have had some good repairs done recently to my harness and impact vest by The Wembley Shoe Repairs place. It's virtually accross the road from Hold the Line kites (opposite corner to the Wembley Hotel).
These guys did pretty good work on a couple of very fiddly (and difficult thickness) repairs for $10 each. Both repairs saved me many $$$. My harness would have gone downhill fast if I didn't adhere to the "get someone to stitch it in time saves me ninety nine" philosophy. The vest got a major mangle (ripped completely down one side) thanks to a mega stack and I'm stoked not to have to fork out for a new one until at least next season. Same day service too.
Reccomended.

They did look at me funny when I said "Can you repair my rubber vest?" though...