And thus, we can assume, they had (have?) access to a lot of European instances and personnel, both residing here in Belgium and roaming using BGC’s network.

And not a single fuck was giving. Not one. Please remain calm and keep on hypnotoad.

If GCHQ was indeed the agency concerned then this investigation is unlikely to go anywhere and the most that can be expected is some sort of diplomatic complaint from Belgium to the UK, its EU and Nato partner.