The following day, the Wednesday, I took two lateral-flow swab tests.
Both were negative and I carried on with life - errands, shopping, delivering pictures for my art show, in Bermondsey, south-east London.
I still felt I had a bad cold.
Candidly, had I not been working at Broadcasting House with younger colleagues who had not been vaccinated, I might well have continued and tried to host my next Sunday programme.
Instead, I went to take a polymerase-chain-reaction (PCR) swab test at the north London site by the Neasden Temple.
At 08:00 the following morning, I received a positive result and was told by NHS Test and Trace I must self-isolate for 10 days from the first symptoms - therefore, in my case, until late on Friday, June 25.