This page ranks all the escape rooms in (or close to) London. You can see my complete rankings here.
* Enigma Escape: The Killer has been redesigned since we first played, modifying several of the parts which I was most critical of. Having exchanged emails with the owners, and looked at TripAdvisor reviews, I suspect that, were I to visit it now, there’s a good chance it would be a 4 star review.