The premises for their strikes are invariably irrelevant. They'll always find a reason simply in order to flex their muscles and remind everyone who's boss. The point is that the whole thing needs to be broken and started again with workers being paid sensible amounts, with sane levels of holiday and benefits. There is no more disgraceful example of what happens when unions are afforded too much power and control than the London Underground. They single-handedly demonstrate everything bad about the union movement in the modern world.