In fact, it's really only a handful of the more Parisian style restaurants in London which still have jacket requirements. Markus Wareing used to (this might have changed with the relaunch?), and Le Gavroche does, but I actually can't think of any others that I've come across. The last public bar with a jacket code (the Ritz) ditched theirs a while ago - even the bar at Dukes now just requires a collar.

I have been following this conversation about suits with some amusement - nowadays many Americans both East and West coast dress very well, but as a European it's a rare thing to find an American in a suit which doesn't look like it's from 1980s Wall Street.