Yes, very much so. I am an experienced Data scientists, and I looked around Europe for the last four years, needing a new job every three to six months, and London consistently had the top 5 best offers, be it in quality of the project, money raised, size of the db, etc. The conferences have been consistently larger, better and more relevant here than in Paris, Stockholm, Helsinki. The Meet-ups everywhere were good, but you have usually 5 people who are familiar with your specific implementation at most, 10 more considering it; in London, you have three to ten times that many people.

I have not tried working in Berlin yet, but all signs seem positive, and life is much cheaper there.