Thank you.
That explains why everything is working.
I dont think I will be fitting a glass rear window soon, so I will ignore it.
I noted previously the heated rear window when fitted runs to the 30A fuse that powers the cooling fan, I may be wrong, but I did wonder if that fuse then would be uprated, I lost a cooling fan once with disastrous results on another car, because the manual under rated the fuse when attached also to the full beam.
Happy days.
Much obliged for the reply.