Two weeks quarantine on entry to the country, known in advance and with no restrictions thereafter as in New Zealand, must surely be better conditions for television production than unpredictable three to four month lockdowns on top of suddenly changing local restrictions, as has been the case in the UK.
I suppose Amazon Studios may have guestimated that new variants won’t get past the vaccines and thereby lead to a return of either restrictions or unworkable conditions in the UK. But that would be a gamble.
I think it is also the case that those countries that have suppressed transmission most effectively are also the countries whose economies have been least damaged by the pandemic. The supposed “balance between public health versus the economy” has always been misleading, a red herring; the people are the economy.