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@ChrisNW
@ peahead1880: Have you tried screwing a different BB into the thread yet? I have two old Carlton frames, one has a 68mm wide shell and takes the ISO (British) thread (1963 Carlton Catalina), the other has a 71mm shell and takes the Raleigh thread (1975 Carlton Criterium). I would advise checking with another ISO BB (borrow if you can) before buying a replacement.
Also, if you put a 103mm sugino BB in the 71mm shell it may fit, but the centre line may be out. You may find the left cup screws in a long way if there is enough thread in the shell, otherwise the cup may not go in far enough to support the BB properly and the left crank arm may foul on the cup.
Facing could be the answer but is probably more expensive than the frame.
It will probably work out ok for you, but just check and double check what will fit before buying.
@Ste_S: Have you thought about a threadless BB (YST, and others available)? Cheap enough to try. I bought one of these for my Criterium but it was the wrong length for the cranks I had at the time. i intend to go down that route with the right BB length when funds permit again.
@Lurker103: Did you use "Rotafix" method to tighten the sprocket? If not, google it and give it a go. Make sure you use red loctite too if you're only running one brake.