Even more good work. Heading to be the smatest cat in town eh.
re the old pollen filter: are you sure it's not just a black one? as it looks very clean to me. They are usually bunged up with bits of road dirt, old leaf remnants etc, and yes, the second relay is the one you need for the seats, it's identical to the one beside it, probably pick one up at a breakers from a mondy if a cougar is unavailable.
There were tons of leaves and dirt in there but a lot fell into the scuttle area when I removed the filter. There's a picture higher up the thread showing some of the remains that stayed in the filter.
Thanks for confirming my thoughts about the relay.
Whilst dismantling more of the interior today to clean as well as access blown bulbs, I noticed that as well as the two connections to the cigarette lighter, these two happened to be hanging around "spare" in the same area. They look like head unit plugs to me???

On the subject of cigarette lighters... the lighter itself is illuminated at night (one of the few bulbs that hasn't blown!) but what about the ashtray? The green plastic bit on the r/h side would seem to allow for light transmission, but from where?
Also with the seats out there's an awful lot more room... having removed the rear seats I discovered all of 2p and a few leaves, dog hairs etc.

Easy clean out there compared to the forest of leaves found under the driver's seat. And the view from the back is impressive too:
