Which allowed me to riff " Can't fault your math: 270/100,000 = 0.0027 = 1/370 and 80 ~= 270/3 so 1/1200 is good enough for national. Presumably infection in our rural community is much lower than your neighbourhood to balance its 270/100k hotspot. Infection is two stage: you have to get within spittle distance of that 400th perp AND you have to suck it up yer nose. All the advice this morning on the wireless was about opening windows during Xmas dinner. You are vanishingly unlikely to cop a 'Rona from some rando in the street. But your hour-long coffee with Bestie was bringing transmission likelihood up a good bit. Although nowhere near like being indoors with her; let alone with Louie and Huey and Dewey as well: assuming LHD all independently likely to be the Infective 400th. In that case, you'd be at 1% for encounter and close to certs for transmission. If B+D+H+L are in circulation having similar sessions regularly with permutations of their network then it's getting very likely that one of them will have brought it into your gaff for that party.
Beyond that I would park any worries. There are families whom I defo would not have round for Xmas dinner because I don't trust them collectively to have avoided everyone in their network who had got up close and personal with everyone in their network who was carrying. I danced with a man who danced with a girl who danced with the Prince of Rona. If you have some semblance of a normal Like Before Times social life then infection is likely. otoh, you'd be fine to have Bestie and her roomies to dinner if they are still podded up together."
We've all got to be proportionate here. No benefit to jumping out of the way of the Covid Train if you get run-down by a social isolation jarvey or whacked by undiagnosed cervical cancer. But it's easy to wear a mask in Lidl and we shouldn't be so afraid of the weather that we refuse a walk in the drizzle with a pal who is drowning in sorrow.