When I worked in the UK I used to consult for large operations, mainly retail based. One of the main issues the store managers and the regional managers used to have was trying to get anyone to work over 16 hours because it impacted their tax credit.
The operations had the hours to give, but there was literally ZERO incentive for them to work anything else because the state used to top them up anyway.
Overtime was difficult to hand out to the shop floor employees, so some of the operations used to ask them to do it, and then give them whatever it was in lieu off in another week.
The British economy is in a poor state, you strip away working tax credits, or you increase the minimum wage and this gets passed down to the customer in some form or the other.