[peterhi]

This was normal for me for good many years. Given that few companies promote internally (or that there are fewer promotions available to staff) means that if you want a change you will probably have to move on anyhow

I would say that your first concern is to find something that you actually want to do. When you leave to get away from a job you will probably end up in the same space and the cycle will start again

The money you get paid to work in London is in part because how expensive London is, so moving home with a pay cut may actually see you better off

Be careful of how this will affect your relationship. You don't want to get to the point where the line "I put up with is this shit for your career" leaves your mouth

Sports data (odds and pricing) is another area that ML could get you a job