Dear Mary: How can I self-isolate without people bothering me on Zoom?

Q. Caught in Switzerland as the ski resort shut down around my ears, and feeling like a walking health hazard, I returned to Somerset to begin splendid isolation days before it became fashionable or mandatory. I’ve been getting loads of jobs done, and the dog is happier than ever, but my peace is being perforated by London friends — the sort who associate solitude with boredom — inviting me to virtual dinner parties on Zoom at a set time with the inescapable tagline ‘we know that you have no other engagements’.