Obviously, the number of two ball clubs in the UK is incredibly small. Most British golfers will never have played foursomes, and most of those that have will have done so once a year in a club competition.
BUT
The tiny number of clubs where foursomes is the order of the day are clearly extremely influential in the way that British golf is perceived around the world. I think I would also argue that, in many ways, they are among the nicest places to be a member and play your golf. Obviously part of this is that foursomes clubs are typically old, exclusive and high end, but the speed of play is a major part of that too.
I've mentioned Huntercombe in this respect here before I think. It is essentially a pure two ball club, perhaps not _quite_ as fastidious in this as Rye, where Greg Ramsay, Martin Ebert and I once played as a three ball. Martin had obtained special permission from the secretary for this, but still spent the entire round looking anxiously over his shoulder in case some members might see us and take exception to our format. Back to Huntercombe. It is, I think, the most rigorous club I know about quick play. In the past, if you were in the habit of taking more than three hours to play a round, you could expect a stiff letter from the secretary. My friend Marcus Lovelock now occupies that seat, and I'm sure he's far too nice to send such letters, but still...
Royal West Norfolk (Brancaster) is another of the most fastidious clubs about two ball play, and the only one I know that offers visitors a green fee discount if they play foursomes. If not, you can play (two ball) singles, but you pay full rate.