That's a long way from Bristol H
The way I have found them around me is via google but it can be very frustrating. Such searches as none ferrous stockholder or supplier might bring something up, same with steel and cast iron. Also yellow pages. The none ferrous supplier I use didn't have a web page some years ago. Some of the smaller ones still wont have them. Many will cut to size and have a trade counter.
Off cuts though – of late wish you luck. They tend to keep them until some one asks for the size they are. I did know one with an off cuts room, pick, weight it and pay 5% over scrap. They were taken over and the lot thrown away. As the man behind the counter had taken great glee in telling a number of model engineers that I have never gone there again. William Gab used to supply a lot of model engineers and I am sure that their business was worth while.
John
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