It says so here, and I see no reason to disbelieve it.
One of the coordinators of the UK's new network, Alan Penny, told the BBC that he thought there was important expertise in Britain too.Of course, it's a pure coincidence that a lot of that important expertise goes into recording our phone calls, internet activities and even walking from point A to point B.
But whatever: if on our way to contacting an extraterrestrial folks we'll happen to catch a few potential martyrs, no harm caused. Unless, of course, the dudes in GCHQ decide to delve too deeply into the things that we call "privacy".
Then it will become quite another matter, wouldn't it?