Feather #3 has hit the nail on the head.
If the UK CAA issued licence holders, pilots and engineers, with ID cards and also issued cabin crew and everyone else - security staff included - it would make chuff all difference to the aircrew but would certainly be less than convenient for everyone else. Then perhaps they would be more " reasonable" and we would have less trouble transiting airports we aren't based at.
More dosh for the CAA too!!