I'm absolutely certain this has been going on in tiny numbers, but I'm not talking about the very sluggish and highly rationed PCR of which we're doing a mere 6000 tests in the entire country and even countries like Italy are having bad days and doing 17,000 a day for example over the weekend.
I'm talking about the new antibody test kit which Boris mentioned last night which was the most important thing I heard last night. Various sketchy reports that the UK government did a Spain and started ordering them on Saturday on the quiet (Spain started ordering them around last Monday-Tuesday and just distributed 640,000 with millions more on order). It might be the end of this week a few hundred thousand arrive in the government's hands.
The antibody test means that a prison could be given a few hundred and test an entire wing if that was justified in the case of an outbreak. Or staff could be tested every 3-4 days and so on. Or whatever is seen as the most efficient way of saving lives.
We can but hope the stuff is in pipeline. I'm still not sure anyone's in a hurry to push it though