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@peahead1880
Even the guy in the shop was surprised it was a 24tpi thread. Especially when i told him the date, which i worked out to be around '74'. As he explained, carlton used 24tpi before raleigh came around and changed it, bust most carltons had 24tpi pre '70's. I dont know if this is fact though.
I even wondered if it has been re threaded, as i here it is possible, although it leaves the threads slightly weaker.
I had a measure today and the chainline at the rear works out to be 42mm. Is there a way to work out what BB axle you should need, in theory, if you have the cranks and chainrings etc?
I'm wondering if the miche primato BB would be any cop, because i have read that it is adjustable laterally. Am i better off going for a cartridge BB or cups with ball bearing and axle. Or does it make no odds!!!