Any question answered...

i have a 70s sun racer converted to fixed gear, i currently have cotter pin cranks
im looking to put new cranks in it with a square taper bb
anybody know which one will fit?
i was looking at this one but i dont know if it has a british thread
http://www.chainreactioncycles.com/Models.aspx?ModelID=22376

It will either be British (BSC, 1.370" x 24tpi, left thread on right cup etc.), or, if you're unlucky, it will be Raleigh threaded, 26tpi, pain in the arse, as Sun was a sub-Brand of Raleigh by the 1970s.