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@Rik_Van_Looy
Yesterday morning I gave the BB threads a good clean and screwed the BB from the BSA donor bike about 1/3 of the way into the frame. before hanging the solida cranks on to see what they look like.
The BSAs BB cups had a 16mm "dog" so to complete the fitting I tried using a big vice to grip the cups...
They only went about 1/2 a turn so I gave up and went inside for a cup of tea. and considered purchasing the park tool for the very job.
Halfway through my porrige this morning a thought occurred to me.... wouldn't it be curiously ironic if the threads on the BSA were not BSA?
When Raleigh took on the BSA name, it would make sense that their cheap 10speeds such as my donor "Tour of Britain" would also take on their whacky threads!!! (34.9 x 1.06mm, 26 tpi instead of the BSA/ISO 34.9 x 1.06mm, 24 tpi) - I put a vernier to the BB shell and voila 71mm. Glad I didn't push it too hard then - hopefully I've not done any permanent damage to the BB shell with my fiendish vice-pushing. I'll head to the LBS at lunch and see if they've any sensibly threaded BB cups to offer!! I suspect that the extra 3mm's worth of protrusion on the NDS will not cause any problems so I can probably get away with just the cups if they don't have any complete cottered BBs!