How long would you need to work in London for to build up the skills to make it worth hanging on for? That’s what I’d perhaps base my decision on.
Also you could look at commuting – coming from further out is more costly but can be strangely faster than when you live in London.
We are moving to Surrey so out of London. It will be a 30 or 40 min train ride to Waterloo which is faster than my current journey of train then tubes!!