I have just done a COVID19 test.
Note — this is not the “have you got it?” test which the government is having so much trouble sourcing. This is the “have you had it?” test for antibodies. It was a demonstration unit and currently not approved by the govt.

Bit of background here. Although 30,000 of these have been sent to UK pharmacies, they can't at present be bought over the counter. Supplier is Pharma Doctor. Accuracy said to be 80%. A colleague who's certain he has had it was very surprised he also came out negative earlier.