im not sure about croydon but he did work at both SubTech and Winger's. So he definitely knows his stuff. I have recommended most of my friends to go there and they are all very pleased with his work and prices. Give him a text/call on 0210371393 and say Steve sent ya
https://www.facebook.com/JMRDevelopments
definitely worth talking to. does an excellent job, provides warranty on workmansip, sharp pricing and an overall good guy