Seems like you should be able to work remotely with your skill set even if you have to change jobs. If you can convince your partner to also go remote, then you could both become digital nomads and get your travel in. Or, you don't have to go full digital nomad, you could both just leave London.

There's not much point to staying in a job you hate if you have other options. Money isn't everything and not everyone survives to retirement (even early retirement).