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@benjaminbunny
That is a 26tpi Raleigh BB.
No replacements are available.
A threadless BB might work, but these are usually designed for 68mm shell widths.
Yours will probably be 71mm wide.
The best option is probably to regrease the current BB and put cottered cranks on
or buy another frame.
There's some info on the Sheldon Brown site: http://sheldonbrown.com/raleigh26.html