Work canteens and the unvaccinated

Sir, – Today I produced my vaccine cert to sit in a restaurant for a cup of coffee.

I presume when workers return to the office they will have to do likewise to have a coffee in their canteen (if they have one).

If so, the employer won’t be long in finding out who is not vaccinated. Surely the same rules will apply to office canteens as to the coffee shops next door. – Yours, etc,