I have a friend who works for a high street bank. Every year the bank increases the sales targets of its counter staff and expects them to do more and more unpaid overtime. Yes, they are offered time off in lieu but only at times convenient to the bank.
If sales targets are not met, this can lead to disciplinary action.
I asked my friend why the relevant union, UNISON, did not object to this and was told that the union had agreed it at national level and there was nothing an individual or group of individual workers could do about it.
Doesn't the union need to ballot its members before agreeing such things with the employers.