If your only concern is making money then yes, you can make a lot there. Otherwise no: (IMHO) overpopulated, more insecure every day, expensive, bureaucracy, not so good transport, Brexit, potentially devaluated currency in the near future, no proper food culture, weather and then other personal subjective reasons that I wouldn't write here.
On a side note, I'd suggest to look for something else than money unless you have a very specific project or reason in mind. I made the mistake of taking a job because of the high compensation and benefits on a different country and made me miserable because everything else wasn't worth it - not even the job. Choose wisely, as you'll be the one living it and not us.
I'd disagree with a lot of the points you raise (apart from brexit, potentially devalued currency and our goddamn weather).
Particularly food, it very much depends what you mean by "food culture" and whether you're thinking of "english food" but London has a lot of fantastic restaurants of all types.
On a side note, I'd suggest to look for something else than money unless you have a very specific project or reason in mind. I made the mistake of taking a job because of the high compensation and benefits on a different country and made me miserable because everything else wasn't worth it - not even the job. Choose wisely, as you'll be the one living it and not us.