At the outset, let’s make one thing clear. I do not share the absolute conviction of some who advocate the drugs ivermectin and hydroxychloroquine as prophylactics or treatment for Covid-19.

The court is out on them. Studies are inconclusive. Health authorities around the world are set against them and, from a purely realistic perspective, this claimed treatment horse has bolted as the heavily-backed nag, vaccine, has bolted home in a canter.