I'm looking forward, to the official/reliable sources, which explain what exactly happened.
The links already posted seem legit
We should patiently wait, for the official responses.
Even if the link(s) were 100% correct.
The real source(s) of the outbreak/hacking, could have been done, somewhere else in the world.
Even if it does/did come from that country. It could be completely unrelated to the government(s), there.
E.g. London, has been the source (if I remember correctly), of at least one, massive hacking outbreak, on a very big scale.
Of course it had nothing to do with the UK government. A hacking group/person based in London/UK, did it.
I'm not 100% sure it was London, may have been elsewhere in the UK.
Best to wait till the official responses occur. Innocent, till proven guilty.