I wish to add to the discussion by providing specific examples of abuse of Radar keys.
Sheffield railway station give them out to staff in the in-station shops (e.g. W. H. Smith). When I protested the response was, "What are the staff supposed to do - pay?" The station charges for non-disabled toilet use - although there are free toilets on Platform 5 (something not advertised).
A Sizzling pub called The Norton in Sheffield (Meadowhead) simply leaves the door of their Radar key toilet open. One time I was treated to the lovely sight of a drunk pissing up against the wall.
The point is, the law requires there to be reasonable adjustments for disabled people - meaning one could argue that an organisation like Sheffield Station are failing to make reasonable adjustments by making disabled people wait while able-bodied staff from M & S use a facility that is actually adapted for persons using mobility aids.
