Why?
Supposedly, the tube drivers want 3 days pay for every bank holiday they work, plus a day off in lieu. Absolutely ridiculous.
It is high time we had a mass sacking of RMT and ASLEF members. No, we don't need 20 useless RMT staff saying "this train is about to depart" or "move right inside the carriages" on the platforms. Automate the trains, like they do in so many other countries.
And there are plenty of people who would be glad of the (rather easy) work, at half the salary and perks.