Just listening to the LBC interview with the tube union leader and tfl. The TFL representative (Mr Brown?) is expecting the tube staff to swap their day shifts for night shifts and is surprised they are voting to strike!
I can imagine the outcry if any other employer suddenly turned round to their staff and said oh, by the way, you will not be working days next week, you have been put onto the 10pm to 6am shift instead.
No consideration at all for family life, or health.
I'm an ex night shifter, socially and medically there is a significant cost. You can't just suddenly tell parents that they are now night shift workers.