Jean-Lill
Why not go to work by the tube that day, park somewhere else and catch the tube, they cannot picket inside T5.
Not trying to be argumentative as I agree wholeheartedly with you, but why not just exercise your right to go to work normally and not have to change your daily routine.
If the Union decide to take IA and you, through your own reasons and for your own job security, decide not to then, in a democracy, that is your choice and you have the right to work without reprisal.
Anything that comes against you is unlawful, unfair and highly unprofessional.
Good luck to all.