Thanks mate. I found one but post it up anyway.

It looks like the elements have heat sensors. Also the side bolster elements are joined to the base elements?
Trying to figure out the issue with a loom and mk2 switch I have. I think the switch is faulty and could repair this one using the insides of a mk3 switch. Just need to see the insides of a mk3 switch now before I purchase one

When I switch on the drivers side loom via the switch, both relays click.
The left side does not click and I have swapped the relays and still the same.