Elrel
It doesn’t have to be London perhaps. Maybe he can find some work with accommodation somewhere smaller, even in the countryside. It’s a bad time of year for seasonal work. Independence doesn’t seem to be a priority for him. Very difficult for you and your partner.
I first realised in the 1980s that a lot of young people who claimed to be looking for A job weren’t. They were only looking for THE job with nothing boring or menial and everyone being nice to them. Life just isn’t like that.
Elrel I think the mantra was "You can be whatever you want to be"
Many children, when interviewed, wanted to be a pop star or a footballer no matter that they couldn't sing or weren't that talented at football.
I must say that my DC and friends' DC did all kinds of jobs when they went backpacking.
However, the one criterion was that they worked hard.
No-one wants to employer a slacker.