I have added a wiki to this thread. It needs more work on it, and in particular if you are at LBA, EDI, ABZ, BHD, JER, IOM in the next few days it would be good if you could ask the gate staff, or even better anyone supervising boarding, what the arrangements are locally, for both drop of and return.
If you are looking at this on a mobile device the wiki may not be visible, but if you either switch to Full Site (bottom of the screen) or go on to the full PC version you should see it.
I think the situation with wheelchairs is likely to be complex due to both the size of the retracted chair, the arrangements for assistance and the ability of the passenger. So I think post 4 gives some general pointers.
I notice the places we do have listed could be suggested to be kid friendly.