There seem to be some confusion.
As we understand the rules at present, you cannot currently enter the UK if you’ve been in or through a country on the banned travel list (sometimes known as the ‘red list’) in the last 10 days, unless you’re British, Irish or you have the right to live in the UK. This ‘red list’ includes countries such as South Africa, Zimbabwe and some West Indian islands. We have heard nothing from the government or the ECB on any possible relaxation of these rules. The link below explains the current position as we see it:
https://www.gov.uk/guidance/transport-measures-to-protect-the-uk-from-variant-strains-of-covid-19
Travellers from Australia and New Zealand are not on the ‘red list’ at present but both have very strict rules in place to prevent/restrict overseas travel from their countries.