BBCNEWS BBC News December 1, 2021 20:32:00
Have a gathering of over one person indoors without it being reasonably necessary for work — that's for work purposes. and at the same time, you had government guidance, which was very clear, christmas guidance — you remember there was a lot of talk about what we could and couldn't do over christmas — and at the same time, you had guidance that said, "although there are exemptions for work purposes, you must not have a work christmas lunch or party where that is a primarily social activity and is not otherwise permitted by the rules in your tier." so i think that's pretty clear, actually...
Source: archive.org