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Yep, I did my latest ONS PCR test yesterday, confidently answering "no" to the "Have you been in contact with anyone in the last 7 days who has subsequently tested positive?" question.
Of course the day after I find out someone I played 5-a-side with, and then went to the pub with, last Thursday has tested positive. And also my BiL who I had a boozy night with on Saturday, but then he most likely picked it up at the football that day so was unlikely to be infectious.
Lateral flow just now is negative but I've got a nervous few days to wait for the ONS PCR result. If that's positive then there's a relatively expensive theatre outing this weekend that is at risk (not quite Aus flights though I know.)
Booster can't affect the PCR as the PCR is looking for bits of viral RNA that aren't present in any of the vaccines.
PCR within 5 weeks of having covid is another matter though. In reality it is only a very small percentage of people that continue to test positive on PCR way after the infection has cleared up. The ONS has figures on this, I think the phrase to look for is "clearance time".