In article , Recliner
writes
It's the home collection of pinprick samples for lab analysis that the MHRA
is dubious about; it is explicitly not against 'rapid' tests. Presumably
the problem lies in keeping tiny pinprick blood samples in good condition
during the several days it might take to get them back to the testing lab.

We did these last week. You prick your finger, using a provided lancet,
and drip blood into a small tube. Seal the tube with the special cap.
Attach a label. Put the whole lot in the included special envelope which
is designed for the job and pre-labelled. Take to the local post office
and give it to them; it's pre-paid express delivery. Checked and it was
delivered at 06:05 the following morning and we were emailed the results
later in the day.

--
Clive D.W. Feather