GCHQ intercepted foreign politicians' communications at G20 summits
This is precisely what the likes of GCHQ and the NSA are for.I would imagine that any G20 host and it allies would use the opportunity to gather intelligence. I would also assume that where ever it is hosted, many intelligence agencies would be active.If not, then what are these agencies for? They were never designed for crime fighting or mass surveillance of populations. There were and still are for spying on nations. G20 summits are a prime and legit target.IMHO, this is a proper use of such agencies.