South Korea is geographically isolated. UK is part for Europe.
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The blood transfusion service NHSBT has been doing surveillance of the prevalence of Covid-19.
This includes samples from blood donors across England, which are tested each week for the presence of antibodies.
It found that the antibodies were present in 1.5% of donor samples in London in the week of 23 March.
Given that it takes at least two weeks for antibodies to show up, that means those people got infected at least two weeks previously, in early March.
That is only a week or so after the first confirmed human to human transmission in the UK. Bear in mind that donors are advised to wait a couple of weeks after any sickness before giving blood, so it might have been even earlier - unless they were asymptomatic and never knew they had been infected with a virus.
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That is the scale of infection in the UK before it was that noticeable. Try contact tracing for 1.5% of Londoners and the rest of the UK.