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The tax authority said this was not a cyber or hacking attack, the likes of which have affected major retailers in recent weeks.

But I think all that changed after it became clear that Russia had helped him win the 2016 election with the hacking of the Clinton campaign's emails.

The security bodies of 10 Nato countries and Australia said Russian spies had used a combination of hacking techniques to gain access to networks.

For weeks speculation has mounted that disruptive attacks on M&S, Co-op, Harrods and some US retailers could be the work of a hacking community called Scattered Spider.

DragonForce - the name the criminals are using - previously told the BBC it was behind the attack and was also responsible for hacking the Co-op and an attempted hack on Harrods.