This is unlikely to work. The rules varied, but if we look at June 2020 (the “ambushed by cake” birthday sing-song, that Johnson admits attending for up to 10 minutes), the rule was that it was generally unlawful to participate in a “gathering” with people from another household.
https://twitter.com/iainmartin1/status/1493333327645970435
An exception was where the gathering was “reasonably necessary for work purposes”.
So the test wasn’t “is the purpose work-related” (saying good-bye to a colleague; cheering everyone up with a birthday sing-song and cake); it was “is the gathering reasonably *necessary* for work”.
In the context of a deadly disease, with eg funeral attendance strictly limited, it’s hard to see how gathering for a bit of Johnson “boostering” counts as “reasonably necessary”.
Had Johnson been in any doubt, or cared about compliance, expert legal advice was on tap.
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