How so we wear a mask in a pub and drink , surely touching it continuously is a risk
You accept that you are about to indulge in unsafe behaviour and you have to trust the health status of the person or people you are choosing to share risks with. Which means the infection status of anyone that anyone in your party has been close to in the previous two weeks
Venues will (initially at least) be table service only, and at least one person on the table will have to provide name and contact info.
If there is a confirmed case at your table or amongst venue staff (or possibly anywhere in the venue, though perhaps only neighbouring tables), then you will need to quarantine in isolation for 14 days