I have just recently had dealings with Fred at BST he responds to emails very quickly and has good English. I wold also like to add that I did have a small problem in that customs (nothing to do with Fred) opened my package and 4 of the bearings came off the rails and a lot of the balls fell out into the packaging I reported this to Fred and he has sent me new bearing blocks immediately without any hassle.
I will certainly be using him again. ..Clive