I bet it's these guys
Buy a Coronavirus test kit online from an award-winning UK laboratory. On-site coronavirus blood test with rapid results. Test for COVID-19 antibodies.www.alphabiolabs.co.uk
Reading the blurb, I wonder how accurate it is?
E.g. I've just had a "normal" cold; I don't see how this test could differentiate between "normal" viral infections and the coronavirus. In fact, aren't most colds a variant of coronavirus anyway?