[fidotron]

Used to be a much greater proportion than it is today, largely thanks to the growth of places like the Amsterdam Internet Exchange.

At one point there was a building on the Isle of Dogs (former island in the Thames) through which an absolutely terrifying proportion of the network traffic for western Europe travelled.

[_delirium]

At least as far as visible hops in a traceroute go (admittedly doesn't cover everything, such as fiber-level switching), most of my traffic to the U.S. from Copenhagen currently seems to bypass the UK. A few common transatlantic endpoint pairs seem to be Paris-Ashburn (he.net), Amsterdam-DC (hwng.net), and Copenhagen-NYC (tdc.net).