Hi Santas, not that's what almost happened... I stayed my hand.
Oh, it was a care home actually. It accused my sister and I of abusive behaviour and threatening to report us to social services and the police. This was after we raised legitimate concerns about our mother's care, it was a way of getting their retaliation in first, smearing our name in advance of any complaints we might make to the CQC.
It also was possibly a first strike to get us barred from the home. In which case, our mother would have been at risk as she relied on us to give her enough drink each day, as the carers certainly didn't, despite our raising it. In other words: 'Complain about us, and we can kill your mother'... if you read between the lines.
(BTW on the subject do not let your relative anywhere near a care home unless the relative has granted you Lasting Power of Attorney in Health and Welfare. This can only be done when they retain mental capacity, it can't be got afterwards. Otherwise, Social Services basically own your relative, you don't, even if you're the ones forking out a grand a week for a care home.)
My sister met with the manager, rebutted most of the points made against her, so on. When we moved our mother to another home within the week, the old care home reported us to social services. Nice.
Now, there's no doubt the care home sent the letter. And it has been discussed with the safeguarding advisor. However, it wasn't actually sent on headed paper, nor was it signed, though of course it has the manager's name at the foot of it. It didn't occur to me at the time, because, well, there was no doubt they sent it. It hit me later.
But if I were to go on mumsnet or to the local press with it, I'd be relying on someone else's word to say, yes, they did send it. Technically I would be the one being libelous, as I could not prove they were behind it, recorded delivery or not. They wouldn't want to admit to sending it if it makes them look bad. It was no oversight on their part.