We're in Liverpool and have taken part in the lateral flow testing pilots here. A few observations on it:
- the lateral flow tests rarely get false positives, so if it shows positive you probably are, but there's a fairly high rate of false negatives (I read about 50% for a self administered test) so if you're using these for people who are close contacts of a confirmed case (or for other things where it's very important that a negative is really negative like visits to care homes) it's a fairly risky strategy. Some of that issue can be overcome by repeat tests, but still I'm not sure I would want DS sitting next to someone in class who was a close contact of a positive case. It doesn't seem safe enough unless they can improve the accuracy of the tests. Especially as in schools there are not any other mitigations such as masks or distancing. I think offering tests to close contacts is a good thing, but still think they need to isolate too.
- where I think lateral flow test can come into their own are in mass asymptomatic testing. They are cheaper than PCR tests and faster, so for aysymptomatic people who are not close contacts of a positive test, doing mass screening would actually make things better than they are now. So for example if they were going to test the whole bubble when there is a case (not just the close contacts) that would actually be an improvement on the current situation and make schools safer than they are now. I don't think that's what they are proposing though :-(
I think that because of the false negative risk, they still need to put other mitigations in place to make schools safer. This won't do it on it's own.
Regarding the tests themselves, they are done exactly the same way as the PCR tests, a swab of the tonsils and then of the nostril. DS is 13 and does his own. He's pretty matter of fact about them and doesn't mind too much (he's had 2 PCR tests due to symptoms before half term, then he's been tested weekly on lateral flow whilst we have had the pilot in Liverpool). However the tests although not painful are a bit uncomfortable and I can see that there might be problems getting some kids to have them, especially younger children. I guess parents of those children can choose to isolate them instead, but of course that still poses issues for working parents so not everyone will feel that they have a genuine choice on that (equally, some working parents might feel that this makes things much easier for them).
So, on the whole I am concerned about this specific plan to only test close contacts - but in favour of proper mass testing in schools, especially if they can also do other things to make schools safer as well.