Informing council about buyers of house we sold

[anneofGreenGable]

Hello, we sold our house last month and completed the sale and moved out. Someone from the council has contacted us and asking for the details of the buyers for council tax.
I thought it is the buyers who should inform the council not us as the previous owners. I never heard of sellers needing to contact the council and providing the TR1 forms, etc.
For information, council has asked following:
1.
Please provide this office with the full name(s) of the purchaser
2.
Please provide copies of the relevant TR1 / completion notices
3.
Was the property sold as furnished/unfurnished?
4.
Name and address of your solicitor:
5.
Please confirm the exact date you vacated your home.

This isn't massively uncommon, in my experience. We had to do it for both places I've sold - well, actually the solicitors did it for us the second time. They said it was usually required if there was a discrepancy in move in date or other information used to calculate council tax, and they needed to prove who was liable.

When cancelling my council tax bill recently I was asked to provide details of the buyer, as well as my own solicitor, presumably to confirm details if the council chose.

Well this is interesting I've never sold a property however I bought this one and I did get a letter to this house from the council saying we understand you now own this property and please call use to sort council tax, or something to that effect.
And I did wonder how they knew!!

I had this many years ago, and assumed that, a bit like selling a car, if I don't tell them about the new ownership I might be responsible for any ongoing debts.

I gave them the details!

I had to provide all of that information when I contacted the council to give them my moving out date. It was part of the online form I needed to complete.