Years ago now I was asked to be on call for a week, 24/7 outside working hours. I was told it would be paid. Being naive I thought I’d be paid at my normal rate.
Turns out the on call rate was based on the likelihood of being called and this project was deemed to be low, after tax I got less than £10 extra for the whole week. It was something like 14 pence an hour.
They had a whole load of restrictions on my life as well, couldn’t be more than an hour from the office, couldn’t be drunk, had to answer the phone within a minute at all times and be able to get on my laptop within 5 minutes.
Refused to do it again after that first week and they ended up having to pay a contractor £400/week instead.