Changed the brown sensor on Gortour's F which needed a few run cycles to sort itself out but the car was running nicely by Wednesday as a result and it passed emissions on Friday, failing on known rust in the sills and a rear caliper siezure. Took the F out to collect a replacement caliper and a driver's door mech, which latter I changed in 40 minutes of continuous engineering language. The alarm system now arms as it should. Tomorrow afternoon, I shall be changing a caliper, pulling the pads out of the other one, winding the pistons back with the newly fabricated tool and setting up the handbrake for him.