If you take part in a strike or other industrial action, you may be in breach of your contract of employment. However, if you are dismissed for taking part in strike or industrial action which is cancelled officially and is otherwise lawful, the dismissal will be unfair if it takes place fewer than twelve weeks after you started taking part in the action, and depending on the circumstances may be unfair if it takes place later
I wonder why they wrote that, given that Unite told it's members they couldn't be dismissed for taking part in strike action. Someone not been entirely truthful?