The choice is yours – there's no official guidance on this
The DfE doesn't have specific rules on this. That means that whether staff can drink alcohol at social events is at the discretion of the headteacher and the governing board.
Check with your local authority (LA) or trust first, in case it has its own rules.
Be sensitive to staff needs
This is especially important if the event is mandatory or there’s a clear expectation that staff will attend – for example, a goodbye party for a long-serving school leader.
If you expect staff to pay for the alcohol themselves (see below), make sure nobody feels obligated to contribute. Remember that rising living costs will be putting strain on many