Re: Why would anyone want to unlock the doors [remotely]
"there is no reason [taking photos, making notes] wouldn't work anywhere else"
If it works for you, fine, but at many major UK car parks it'd probably get your collar felt (or worse), on some specious grounds of terrorism, theft, or similar. Particularly high risk at some of the 'high security' List X sites (Ministry of Defence and their suppliers etc) I used to visit for work, from time to time.