4: No harm asking Motability if you or adaptions installer can take the adaptions of the car prior to returning. This maybe possible without asking, but I’m not the one to ask on that.
I’m always moaning at MB about having to pay for new adaption every 3 years but from memory from many years ago they did tell me I could pay the installers to take them out for private use but you can’t have them put in another MB car because the, then RSA insurance, think its an unknown risk because they don’t know how much wear and tear they have had.
This of course is for adaption that control the car and not for things like hoist and such.