However the test means I am working from home to protect my co-workers, and not attending the Works Easter Do (postponed from the Christmas Do) this evening, which is regrettable. I am doubtful that my co-workers require any protection, any more than I do from them; anyone Vulnerable won't be in the office anyway. The official NHS advice that I find does recommend staying at home, but doesn't insist on it.
As it happened I went back to the Old Place yesterday, but didn't interact with anyone.
Update: two days later, still it, but more faintly. Cough much better, barely there.