If you're ok with employment gaps and the consequent lack of income, go for it. But if you have dependents and/or mortage and/or other constraints, I'd definitely put a whole lot of thought and financial planning into it first.

With that list of skills, I reckon you should be able to find some interest in London, yeah. Might have to lowball the daily rate to start with just to get going but people are definitely hiring those skills.