Indeed.
And if it was work related, then why was his wife there.
You can make the arrangement, as the Tories are, that anything in Downing Street is work related.
And when did it becomes acceptable to bring alcoholic drinks to work.
Where I worked, that was a stackable offence.
In my opinion a lot of this country's problems could be solved if those in Westminister and Whitehall (both politicians and senior civil servants) were held to some of the same standards as rank-and-file public servants anywhere else in the country. If anything akin to the Downing Streets parties happened in a HMRC office somewhere in the regions, heads would roll. Similarly, if it was found that some low-level functionary had used their position to do even a minor favour for a friend or family member (like checking the status of an application) they'd be sacked immediately, in the meantime we have members of the government handing billions of pounds of public money to their mates with impunity. Someone like Boris Johnson likely wouldn't get past the security checks required to take up an entry-level position in most departments - he'd be deemed too open to manipulation due to his financial situation.
Parts of the governing apparatus of this country have been maintained as open air museums/celebrations of the Empire for the last 150 years and successive generations of politicians and senior civil servants have failed to make changes to render them fit for purpose because deep down they're not in it for public service. Half of them are in it for the money and half of them are living out a fantasy of being great Victorian-era statesmen. None of them have any intention of making any changes that would force them to abide by the same rules as the rest of us.
The worst thing is that, as a nation, we've been brainwashed into being in awe of these institutions. Our political system is an outmoded mess which prioritises nostalgia and roleplay over being fit for purpose, but any attempt to reform it is seen as an attack on Britain itself. Frankly, if we insist on keeping a system which works this badly and where there is so little real oversight of those in power, it was only ever going to be a matter of time before we elected a government shameless enough to use it to openly rinse us for all we're worth