cost of car hoist for power chair

how do other disabled members get their powerchair in and out of the car?

I've got some folding aluminium ramps but they're difficult to use, and you need 1/2 the street's length.

I'm wondering about getting a hoist fitted to my Renault Kangoo but don't know where to go locally (Sheffield). I want to stow the wheelchair in the boot, and retain the rear passenger seats, rather than a full wheelchair coversion at the cost of the rear seats.

is it possible to get the adaptation done on Motorbility even if it's your own car?

thanks:D