Ok, so I've now tried the fuse pulling option to look for blown fuses, but none found!

So now what? I'm stumped!

I still recon the power is linked through the same fuse, thats what the fuse diagram seems to say anyway? It seems odd that the heated seat and motorised lumbar support (both fed from different fuses) dont work only on the passenger side.
There must be a connection issue somewhere? But where? All the plugs under the seats seem ok, both passenger and driver side? Is there a connection somewhere else? Behind the dash? That might be loose or come adrift?
Can anyone offer anymore help?
Cheers.
Steve.