My Lords, I pay tribute to the vice-chancellors and to the universities and colleges of Britain for the way in which they have embraced campus testing. It has been a salutary lesson in what can be done, and it has helped to keep infection rates down on campuses where there has been a small number of returning students to date. That is done mainly through LFD testing. Positive tests then have a complementary PCR test, and the PCR test is automatically sequenced if it is positive. The combination of LFD, PCR and sequencing is the right one for keeping infection rates down, but we tweak the formula as and when best advice comes in.