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I lived and worked in London for a number of years, and in the end, no amount of extra salary was worth the packed commute, sky-high rent, bad air quality, and (controversial...) the bad manners of people in general. Moved back to Scotland and my quality of life now is so much better. I don't know how much money I would have needed to make to make up for all the negatives, but personally it was way above what a developer could realistically achieve. Very subjective I guess.