If you want someone in the Midlands - Bikers Paradise in Coventry.
I've had two sets of leathers and two zip repairs done by them very well indeed. I used to take them to them and they have posted them back to me before too.
Like Blade I've also used Joyda leathers. They replaced the zip which broke on my suit and put a patch over a hole I created at Oulton. Using all my skills I managed to fall and scrape the exact same place down the tarmac. The patch is completely undamaged and totally intact. Wouldn't hesitate to recommend them!