When I worked in our Cardiff office last week I was asked to bring in my lunch and avoid leaving the office unless it was really necessary.* It seems odd that they only requested this when you arrive at the office and not in the documentation they sent out ahead of time on returning to work, but it is a step to help I guess. In the London office there is no similar request.
* As is evident from this thread, I deemed going out to check on the status of the outdoor-parasol-road thing a necessity.