I'm sure we'll get some postcards together again
Thanks to Maggie there is little we can do with regards direct action in the UK.
To be lawful, industrial action must:
be a dispute between workers and their employer relating to terms and conditions of employment, sharing out work, discipline, or union issues
not involve 'secondary action' or action taken by the employees of an employer who is not involved in the dispute
not involve unlawful picketing
follow a secret ballot, for which there is a legally-required procedure and timescale.
At the moment this is action over a political decision and as such would be illegal in the UK and would leave the Union open to legal action.