@Cue Yes the C-19 ZOE app , other than the basic questions they ask daily , there will be days they require more info. i think i triggered a swab test because they needed to know how many times i had left the house in the last 10 weeks. i replied i hadnt left the house at all . if you registered your interest when/if they ask if you would like to take part , you give your consent . they already should have your details and will be in touch. I got an email to advise what happens next. i've been using the app since its launch. @Lucy there are varied groups they are looking at , looks like you triggered one of them then.