Sorry to jump on those people who are suggesting this was brought on by the issues at STN earlier this week, but the notice was actually communicated to airlines on 27 Nov.
The actual directive is quite clear and it
does not state the ID must be issued by BAA, only that it is a valid ID issued either by the aerodrome or by another competent body authorised to issue passes.
A pilot's licence or boarding card should not be used to gain access to the RZ when the holder is on duty.
All seems pretty reasonable to me
Now - as for car-parking and the 36hr limit - that's a whole other issue