It's aliiiiive!! .. and by it I mean the blower :D Replaced the blower resistor - didn't help. Connected the blower itself straight to the battery to check and it span right ip. All fuses seemed fine, so the last element must have been the plug... quite obvious, looking at the plug itself. Took a while to find a good condition replacement part (had to be cut off a scrapped car as it's part of the wiring harness), but finally got it and connected up. Blower now works and means taking the car out to stretch its legs is a bit more bearable with the heater working :D