This routine works fine on Virgin Media too.
I do it routinely every year or 2.
This time,a few months back, I really did think I was going to get cut off, really wouldn’t offer a better deal. Got an end date, the lot.
However, sure enough, 2 weeks later the call arrived, totally different attitude and got the discount I was after. The call always comes from their retention team.
All the big BB/ TV providers work fairly similarly to my knowledge.
That might exclude Talk Talk as they are a complete joke of a company.
There’s threads on this all over the web, hundreds of millions of pounds must be getting paid extra by people just because they don’t call and haggle.