It was only Monday evening when Sky News first revealed that China was behind a massive cyber-attack on Ministry of Defence systems - and a day on, it is still a mystery.

The MoD has been working at pace to ascertain the scale of the leak and damage done since it discovered the payroll system - run by an outside contractor - had been hacked, exposing names, bank details and in some cases addresses of serving personnel. I have had it confirmed through multiple Whitehall sources that the Chinese state, possibly working through a third party, is believed by government to be responsible.

Other media outlets have now caught up and had the same confirmation. Yet the government is not naming China publicly.

There is a huge amount of nervousness inside government about how exactly to handle this publicly. Read more:Beijing poses 'constant' threat to Western cybersecurityChina 'trying to undermine our democracy' The reason for the government not naming China today has prompted much suspicion.

I'm told there is a more straightforward explanation. The principle reason for today's public announcement is under data protection laws, those affected need to be informed within days of the breach.

However the "designation" process - formal blaming of another country - takes months, even years, to conduct to the evidential standard required, as it did when Oliver Dowden blamed China two months ago for the hack of the Electoral Commission some years earlier. Some will still believe the government does not want to say things publicly because of the economic relationship, and Rishi Sunak's own nuanced position on UK-Sino relations.

Yet that ship has sailed - China is being widely blamed, so ministers look odd, and even a bit cowardly, for ducking the question. This speaks to the wider uncertainty - whether the UK policy on China looks more to the US, where some hawks want China to be seen as an overt threat, or looks to the EU - President Xi is currently in France - which takes a more emollient role.

Can Britain have its cake and eat it - yu yu xiong zhang jian de (a Chinese saying meaning you can't have everything you want and must choose) - on this issue for much longer?.