9th June is the date bandied about for UNOFFICIAL strike action, which would be foolish. Not only would you lose money, you stand to lose your job too. Besides, I'm on standby that day
So few would take unofficial action, it would be a complete waste of effort.
Wait for news from the union about official strike action if the talks don't make any satisfactory progress. If the rumour is right about no rise in basic, well ....