Opened one of the comfort relays up, burnt out solder joint.. opened the other 2, exactly the same thing. Reparied one, put it back in.
It popped the window cutout switch straight away.
So then disconnected each switch in turn and tried resetting the cutout switch.
it was the drivers rear door switch that was causing the problem, one of the contacts in the switch broke off, jammed against something causing a short.
just off to the garage to dig one out now
Can a mod please ad 'Fixed' to the title please