I got my certificate last Friday. 5 Days passed- DIDN'T return BRP. Let's see what happens.

I still strongly believe that I do not need to return it because of the following:
1) I understand that I need to respect all rules and law which I always do. I don't believe that this new rule is applicable to me. My reasonable duty of care is to read all requirements at the time of my applicable and commit to them by signing my declaration in the form. The onus is not on me to visit their website everyday to see what rules have changed. If HO believes that a rule has changed that is going to impact me, it is their duty to communicate it to me either in writing in their approval letter or at the time of collection of certificate at the council.
2) I specifically asked the question about returning BRP to the registrar and she confirmed they have not received any such guidance from HO. This shows me that this is a transition rule which HO is gradually bringing it in.
3) The new form AN has a specific provision about returning BRP and you agree to it by signing the declaration. In this case, yes, if you do not return it you are breaking your commitment of the rule that you have agreed to. The form AN that had no such provision. So, I believe that this new rule is only applicable to those who submit their application under this new form.
4) There is too much ambiguity about this rule. Is it applicable to everyone? Is it applicable to those who got their naturalization certificate last year?
The above conclusion is just my interpretation which might be 100% wrong. It will be interesting to see if others have got a different point of view.
PS. I know you might say to just return it and avoid all this..... and you'll be absolutely correct!

Regards,
Eddy B.