pcat
In the system that Mcgrumpy is in, it is very seldom about the numbers. It is more about his personal position in the UK's "Broad Left". If he can gain more credibility within the Broad left by having a strike, then he will do so.
The actual TU members are, and have always been, an irrelevance, once he has the ballot result. If the ballot result had been against the strike, Mc Grumpy would not involve himself at all.