When the government pass the law for the referendum it was said it will active the outcome IN or OUT. MPs voted as such. No need for a debate in parliament now.

The opinion poll carried NO LEGAL REQUIREMENT TO ACT ON IT, what part of that haven't you grasped? There was no 'law' passed reference it.
However, that's not even what's being discussed, it's how they do act on it LEGALLY that we're discussing, and the legal profession seems fairly unanimous that it'll have to go through parliament, as the 1972 act that we joined under, has to be repealed and this can only be done by the House of Commons.
