We have been told we can't put anybody on the cockpit jump seats except persons on duty (assosiated with the operation of the aircraft) when we fly in UK airspace.
That pretty much limits the use of the seats to CAA inspectors, checkers and supernumary crew on familiarization flights.
Crew positioning can't be carried in the cockpit. We have been told that.
We have also been told if we break these rules, we risk loosing access to airside, and my company risk loosing the right to operate in UK airspace.
But Ryanair can use cockpit seats as pax seats for pilots traveling to and from work, and I see nothing stopping pilots from putting on the uniform and getting a free ride going on holiday.
The whole system in UK is a joke.