Not wishing to be dull but EHC`s (important as they are to all parties) have always been required for non-European countries.
Now, if chappy couldn`t work out in the 4 to 5 years that we were going to become a non-European country ourselves then there is little hope.
Back in November 2020 even those EU loving Scots had it clearly spelt out on their website what folk would need....
https://spice-spotlight.scot/2020/11/30/after-the-transition-period-export-health-certificates/
He has chosen a better option for his niche business, it won`t apply to everyone and each business will make the choice that suits them best. The vast majority will want to get through Covid and see what happens then, even those across the Channel...