Well, I suppose I can post this now it's all official: I have a new role and I start on 1st October. It's with the same employer but at a different location, away from London, closer to home. I knew I was being offered the role a while ago but the hiring manager had to get approval to change the pay grade and get an acceptable salary agreed. It actually worked out better than I was expecting.
We also sold our house down south a couple of weeks ago so it was a strange/stressful period not being 100% sure that everything would all come together. We're so glad it has — now the next chapter can begin.