Perchance is there a 12VDC outlet in the 85's trunk or frunk (or as I understand it is called in the UK the "froot"). Simple question to be sure but my car's not here yet and, living in Utah with our silly anti-Tesla law, I can't just go to a dealership and check.
No direct outlets in frunk or trunk. You have to tap into the fuse box in the frunk or tap into 12v lines to the lighting in the rear.