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Apology needed. My memory was defective on this. I've checked with her and you and @MTB-Idle are right, the proceeds are not ringfenced as I incorrectly said.
What I was confusing this with is that in 2012 they made a commitment to replace all homes sold via right to buy 1:1. In theory great, but she says in reality there are 2 problems. 1. They didn't meet the commitment, and 2. It isn't a like for like replacement. As such, you could replace a 5 bed house with a studio flat and you've adhered to the rules.
I'll wind my neck back in on right to buy. In theory good, but I'll agree that in practice it is deeply flawed.
That's not my recollection and Wikipedia seems to agree with me.