I've just had an important looking letter in the post marked "On Her Majesty's Service" inviting my household to take part in a paid study to be swabbed regularly for covid over the course of a year. Apparently the reimbursement is up to £425 per family member. I'm trying to work out if this is a genuine study. To be honest I'd participate in this kind of thing for free if it could help the scientists in any way. Has anyone else had such a letter? I'm trying to work out whether we've been randomly selected, if this is going to everyone across the country, or is it some kind of con? Please let me know your thoughts if you've had the letter too. Apparently it's a joint study with university of oxford and office for national statistics. Not sure if I'm being naive and should bin it or not.