"People who work at GCHQ would sooner walk ... than be involved in ... ‘mass surveillance’" Sure!
So please explain who/why copied all those Yahoo pictures?
And does he/she/they still work for GCHQ?
BTW: Those pictures that regaled many papers yesterday showing 'covered' GCHQ workers were actually quite revealing.
One picture showed roof-mounted aerials/antennae very clearly from which you could deduce approximate frequency and direction, whilst another picture clearly related the same aerials/antennae to major features of the building.
Guess the subservient UK press is awaiting a DN notice so the news can be censored, again.