How does it feel to know you have gone through all that trouble to act as an illegal agent working for The Council's financial interest? Of course their not going to say anything, youre covering their losses and if there is a dispute in future, your at fault, not them. Get it official, get it in writing, I dont know why on earth they wont just allow this ligitimately.
Rent out your homes if you want. The Council have no real way of punishing you for doing so. The reality is that most of us paid over the odds for our homes and they certainly do not look like a great deal with hindsight and were not so affordable.
If you go to the Council and tell them you are renting out your home you are allowing the Council an opportunity to suspend the 20 years clawback from running out.