Union reps or union officials are not allowed, by law, to instigate or coerce employees into strike action; well any form of industrial action. It is for the membership to suggest and vote for industrial action.
I would imagine some form of meeting will be held between the union and its membership to discuss the next steps. Crawley football ground used to be a good place for a mass meeting. Maybe Bar Med would be more suitable in Crawley, or maybe somewhere a bit more exclusive Up Town?!