They seem comically bad at getting any intel - much of what the captured spies were caught with were publicly available documents. They had "gained access" to some organisation, but that org had open public access anyway.
I'd be amazed if GCHQ was not listening in to US politicians. I suspect that's why Obama had so much work done to his mobile phone before he was allowed to use it.
Really, governments spying on other governments is not news. The spies get found and expelled by one country, the other country expels a diplomat or two. Everyone expresses outrage. More spies get sent in.
It is perfectly well known that the US are the only such country to break the trust of their "friends".