Rear flexis done.
Had an ABS light grace me with its shining glory, so investigation revealed a dead sensor. Had a spare in the garage in a hub, but stuck in so I had to cut it out. This is fine as if I ever need it for my own car, i've sacked off the ABS anyway.
Fully road legal now and been doing some road testing
Of course it wasn't going to let me off completely - a small trail of smoke off a hot turbo led me to this weeping oil return
What an actual bell-end to access with the turbo on the car! Anyway, got that off, cleaned up and sealed on with a smear of Reinzosil. I also fixed a broken stud on the turbo support bracket while I was there. Out for a good 20-odd miles last night and seems to have resolved it