From Motability website
Fitting a dashcam to a Motability Scheme car?
If you’re considering fitting a dashcam to your Scheme car, here’s what you need to know:
The dashcam must be plug in type and not hard wired into the vehicle
It must be attached in such a way as to not cause damage to the vehicle (eg fixed by suckers and not permanantely attached to the dashboard)
Any associated costs must be covered by you (including the purchase of the dashcam and any fitting/removal costs)
Your dealer may also be able to help advise you on purchasing and installing a dashcam