I might contribute a bit confusion, as I discovered during a chronic attack of this enthusiast disease called „featuritis“, with symptomizes with acut cases of installing / altering genuine features ...
On LHD SE of my model year, the footwell illumination is NOT prewired. Neither left or right, nor in the rear part of the Centre console.
Left hand rear door has plug and connection to Becm for a puddle light prewired, right hand, where the connecting wire is much shorter, the part between b-post and BECm is missing in the loom and connectors, whereas the plug in the door is existing ... should have taken a selfie scratching my head while trying to make sense out of this ;-)
Earth strap to bonnet is not existing ...
I think there are 6 editions of the electrical trouble shooting manual?
If You open the fuse box lid under right hand seat, above the fuses under a usually thick layer of dust could be a paper label with a printed number ... there should be either a „L“ or more probably a „H“ for highlife readable ... as well as part numbers.
Electric seats are at least pre facelift easy, if You got a matching loom and seats together. You can do a neat addition which looks like factory fitted. I had manual heated leather seats, now the driver seat is electric with memory ... the Electric ones are much better adjustable and comfortable (for my ergonomics).
Funny finding, I had to disable mirror dip after plugging in the seat with memory into the BECM, because I have only the 6-wire mirrors, which went down everytime I engaged reverse, but never went up again ... after two times reversing I realized and heard mirrors moving ... another surprised facial expression ;-)