I hire skilled and unskilled workers in a variety of job positions and pay both "low" and higher rates of wages, but every set of wages comes above the UK's minimum wage. I have never in my life paid anyone just minimum wage.
So what if a middle-manager-type ended up "flipping burgers" or "mopping floors"? Better to have a job than no job, this is the problem with too many in society, they turn their nose up and think they're better than other people. They're too good for some jobs. Being too good for a job is no excuse to be unemployed. Same with returning to school, nothing wrong with that either. Spin it around, why should someone "flipping burgers or mopping the floor" be paying taxes to support those so much better than them that they don't need to do that?
I've not seen any source for how many jobs are available right now, it is not something that can be easily measured for one thing.