Hi Guys
Just to say many thanks for your advice.
It was not the fork bushes, but the inner hub was ?proud? by about 0.010? in one place, as some of you guys suggested (NickSR, BSA-Bill, Brucie64, Muskrat and others)
I bought oversize shoes, and had the inner hub skimmed, and the shoes turned down to match
The job was done by an engineer in the West Sussex BSA Owners club
Judder Gone!
Many thanks for your help ? it had not occurred to me
Roadrocket649