Nice that the article links to the original Time Out "Eavesdroppers" article, but only mentions an "American journalist" as author, ignoring Duncan Campbell. Both were given a hard time by the authorities, which Campbell wrote about at The Intercept: https://theintercept.com/2015/08/03/life-unmasking-british-e...

Edit: having read it, very lightweight as you'd expect. Interesting they are publicising their new in-house historian (https://twitter.com/TrooperAbs) but not the new authorised history that has just been released (https://twitter.com/GCHQ/status/1320292272488009729).