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@ChrisNW
juliettyspaghetty:
I also have an old Carlton frame and have had exactly the same two problems you've had (frame even looks similar - same lugs).
I used a penetrating spray on both and it didn't seem to make any difference.
I eventually managed to free the stem after trying all those things mentioned above (and the stem was still stuck), by putting the forks in a vice and twisting the bars back and forward while pulling them up at the same time until I could twist the stem right out. This took about half an hour and was really strenuous work - the wedge which must've never been undone had permanently stretched the inside of the stem making it really hard to remove. I am lucky enough to have a sturdy workbench with wooden faced vice, so could get plenty of leverage on the stem.
Although my cotter pins came out ok, I have still not managed to get the drive side cup out of the bottom bracket. There is not much to get a spanner on to, so it'd difficult to get any real weight behind it. Remember - it's a left hand thread in the drive side cup!
I'm going to try some heat on mine some time but I'm worried about damaging the paint job - I was hoping to keep it original.