Our household has been invited to join this survey. Somebody comes to our house once a week for 4 weeks then once a month for the next 11 months and we have to do a swab test for every family member who wants to take part. We get vouchers for every visit for each person who takes a test. Me and DS are going to do it (DH and DD aren't happy to do the swab in the throat so have declined). Apparently 11,000 homes have been chosen to start and they will add another 200,000 or so over the next year. The voucher amounts are quite generous!