Millions of Britons are already taking precautionary measures to guard against catching Covid and having to self-isolate over the Christmas weekend as the omicron variant continues to sweep through the country, polling suggests.A majority plan to self-police in the absence of tighter restrictions by using lateral flow tests before meeting others, keeping their distance when doing so and washing their hands more frequently, according to an Ipsos Mori poll. The survey is published as debate contin