Coming to a brick wall now, I thought I'd take the problem to my friendly local autolecky who seemed to show some interest.
He took the cover off the heater controller and we ran a test with it in situ. We manually made the circuit on the left hand relay
shown and lo and behold everything fired up with the ignition on and engine off. He seem to think the controller is gone west so I think the next step is to bite the bullet and buy one/suck it and see. My only worry is that something else, maybe the controls between the seats are not passing the current hence the failiure of the relay to actuate, the power for which, I think, is supplied on pins 9 and 11 (forgot to check them). However if that only was the case methinks the other settings which do not uses pins 9 and 11 should actuate the relay.
So, in summary, the blower and it's circuit seems fine as is the main power supplied by the relay. The problem seems to be with the relay not actuating. SO, let me check how deep my pockets are.
I've just found one here in the UK secondhand for £45 ($82) p&p inc. That'll do me thank you and what's more the nice guy has said "If there's a problem with it, send it back and I'll send you another"
(there is a God). New, UK, I've been quoted $250. WOW.
I'll let you know how I get on, it'll be a few days.