Bought a stainless goldie silencer from Armours, looks good and is of the straight-through absorption type. They make them to fit a Norton and they have much neater mounting points than the original BSA design.
Also got the pipes from Armours, unplated. I'm not quite so impressed, but we will re-weld them ourselves and grind out the excess material (overlap) where the pipes join, before sending them back for chroming.
I've attached a picture of the original pipe for comparison.
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