There is a guy in London called Dan Gower. He can be found via his company facebook page. He mods, repairs and builds amps, he has done many for some big names that rave about his work as well. He has a lot of videos on the facebook page so you can hear his work. Also give guitarguitar a call, the shop in glasgow know a builder down the street thats good and reliable. I can't remember the name of them though but thats who guitarguitar use. Would post dan gowers page on here but can't link it through my phone. Dennis is the biz but as people say he is always up to his eyes, doesn't respond much to messages and is starting to wind down.