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@ChrisNW
peahead1880, cartridge BB all the way. Far less hassle.
Check out the "Transmission Database" thread on here. That will give you plenty options for BB and cranks.
I seem to remember reading somewhere that most of the cheaper Carltons from mid 70's onwards got made at Raleigh's Nottingham factory, these frames were assoicated with the Raleigh BB. Worksop (the old Carlton factory) was where they still made the higher end models, most of these frames used the British thread (which became ISO). I don't believe the corsa was top end, but it's feasible they made a batch of them there if work was slack.
Google for this info, you'll find some interesting stuff on Carltons if you look hard enough.