Not actually the great unknown Ellers...the genetics of change of the virus, tells us when the virus came to the country (they analyse the virus from people who got Covid on a certain date and then they can trace it back to where it came from...read the article
the article says
The study estimates 80% of those initial cases arrived in the country between 28 Feb and 29 March - the time the UK was debating whether to lockdown. After this point, the number of new imported cases diminished rapidly.
From the DNA of the virus they can tell where itt came from using little changes in the viral DNA . Sorry for bad copy from the article but 33.6 % is from
Spain, 28.5 from France, 14.4 from Italy. the 0.1% is from China
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