... so as not to risk being in isolation over Christmas?... Or will significant numbers keep it to themselves?
Obviously the responsible and "right" thing to do would be to get a PCR, but if, say, I came down with symptoms on, say, 15th, and I was visiting young, fit and fully vaccinated relatives on 25th, I'd be tempted not to and visit anyway if I was otherwise well (obviously with the relatives knowledge). My infectivity by day 10 would likely be very low, and the risk even if i wasn't would probably be something worth taking.
I'm fully aware this wouldn't strictly legal or correct, and as my relatives aren't young I wouldn't do this, but I could I understand people doing so.
Are positive tests going to be artificially low from Wednesday as a result I wonder?