@Winston, fair point re Motability being the bad guys, they are usually pretty flexible and to be honest I’d not bother telling them about activating something like auto folding mirrors but something as seemingly simple as windows tints could lead to issues.
The factory will only tint to whatever meets the regs but what’s stopping someone going to a shady back street place and putting limo black tints on all the windows? They might drive for years without issue or could get 100 yards down the road, pull out of a junction in front of a biker and cause serious injury – could open a big can of worms from an insurance / T&C of the lease point of view.
Maybe a little far fetched but given the blame culture we seem to live in its got to be worth checking with Motability before changing or adding anything that could cause problems down the line.