You've hit the nail on the head there - that is exactly what happens in The Security Industry to a large degree with 60 hour weeks at flat rate the norm.
The Living Wage would give these people a couple of hundred extra per month which could make a real difference to their lives. They could either reduce the number of hours worked or afford some luxuries other people take for granted.
Just as well you don't smoke, £15 buys far more pasties
Don't smoke, don't drink. Rather boring
If I had lower pay I could I guess buy "Value" range of food, but nowhere else to cut outgoings, without getting rid of the car. Our public transport is so poor a car is an essential though, and probably cheaper than using the bus!