It serves me right for trying to revive an old road frame to turn it into a fixed commuter.
Drive side crank arm is solidly seized onto the square taper axle, and has resisted all attempts at removal (including, in my rage, managing to strip the thread of the crank arm when using the crank puller).
So, I've now concluded that my options are:
1. I re-attach the NDS crank arm, and complete the build around the two chainrings I have available (thus abandoning the nice stronglight chainset I have just bought and also having potential chainline issues).
2. Trying ammonia/caustic soda, which doesn't sound too pleasant.
3. Incurring the wrath of Mrs North by trying to heat it over the gas hob.
4. Trashing the seized on crank arm by sawing through it to unseize it.
5. Locating an open ended tool capable of removing the fixed cup of the BB. This seems logical, but a normal fixed cup spanner won't fit and I've already trashed a suitably sized adjustable spanner.
6. Sawing through the exposed part of the BB axle between the crank arm and the frame (risky and requiring a tough as nails hacksaw blade, not to mention highly labour intensive).
7. Taking the frame to the nearest LBS and hanging my head in shame….
Help me..!