In West Sussex you might try Moto di Marino, West Chiltington. Bevels are his thing having raced with Paul Smart back in the day, but he may need some time due to present health issues. He did a great job of reviving my 1983 MHR.
Thanks everyone for all the suggestions once I have moved I will contact some of them and see what they can do. I the meantime here’s a few snaps of the bike after it’s just come out of the back of the garage after nearly 30 years. It needs a good clean but it’s not too bad.