This could get long- settle in...
So dc is in Y6 at primary school - all geared up for leaving celebrations.
On Friday night one mother - let's call her Sam- texts the group WhatsApp. Tells us that dh has tested positive - son in Y6 now isolating. Obviously we all wish her dh well. She tells us son has no symptoms. Husband just has slight sore throat.
All good.
She then tells us that she thinks actually she had Covid earlier in the week - had sore throat, felt shit, etc...
Hhmmm...
We are all thinking it...one person says it: Did you get a test? You sent your child into school all week until today.
Nope, didn't get a test, didn't isolate, didn't do a LFT even. Because she did not know that sore throat could be Covid. 
Has no idea that Delta variant has different symptoms. "How was i supposed to know?" This woman is an architect - she's capable and literate.
Next question - have you all had a test now? Nope.
Okaayy. "Because noone else has symptoms". But courtesy perhaps to a Y6 class who would like some certainty around their last week - especially with the last 2 years they've had. Maybe?
"We'll get a test...boohoo I feel attacked...witch hunt...blah blah".
Next day "Sam" reports she can't get a test, but no hurry, still no symptoms. Other parents manage to book tests that day at the local centre almost immediately at different times. Y5 class now isolating, so lots of people going for tests - all get appointments in the hour. Everyone except her.
About 9pm "Sam" sends another msg:
"Hi Laura, I heard on the grapevine you now have symptoms, must be so sad for you dc."
"Laura" explains that yes, she has symptoms and had a PCR test in the week which was negative. Her kids isolated because Laura isn't a cf and doesn't send her kids into school when she has symptoms. Kids went back because it was negative. By Saturday Laura still feels ill - she explained, so isolated family again and went for an immediate test- she didn't need to, she had already tested negative on PCR plus daily LFT which she does for work. She did so because she wanted to be doubly sure everyone safe.
"Laura" then enquires as to who told "Sam" that she has symptoms, as she doesn't appreciate "Sam" putting her medical info on the group chat - why didn't Sam message her privately? (We know why, trying to deflect from her own selfish non-isolating, non-testing ways).
Sam claims that she was putting something in her car when a woman she doesn't know pulled over znd says "I hear your husband has Covid- I also hear that another mum at the school called Laura has symptoms". Sam does not know who this woman is. A total stranger. But "not connected to the school".
Laura tells Sam to wind her neck in.
Sam tells group she has booked a PCR test for her son who still has no symptoms for tomorrow- Sunday.
Sunday: Multiple covid cases. School is closed for rest of term-very sad for Y6, but we still have their private (not school) party next Sunday.
Sam says "But if my son tests positive, the party will need to be cancelled, as your children will need to isolate". HCP parent comes along - this isn't true Sam's DS wasn't in school on Friday, he has no symptoms, his test is Sunday. Because of the 48-hour rule, rest of class can go ahead with party, as they weren't in contact with her symptomless DS in the last two days...
Silence.
Email from school...Please could Y6 isolate, we are waiting a PCR test to come back. If positive, child had symptoms on Saturday so whole class were in contact with him on Thursday - all will have to isolate for ten days from Saturday. We will let you know test results ASAP.
She has lied about her child having symptoms to prevent the rest of the class having the party without him. Spiteful spiteful bitch. And if she had just isolated and tested on Tuesday when she had symptoms they would all have been able to have the party, including her son.
Someone, let's call her Carly, asks directly in the group -Sam,when did you get the test and does child have symptoms? No reply. She has seen the message.
We wait.
For reference - this woman lied to get her child into school (used mil address), she spread rumours that it was a fix when Laura was voted parent governor over her - she came to me, not knowing I am friends with Laura. She admitted she lied to the police when a friend was being investigated "because she's my friend ". And now she is lying to stop a class of children having a leaving party when they have lost every other bit of their end of primary school week.
I will update as soon as the cf replies tomorrow. If she dares.