I said before, and I will say it again: I take statements at this Dispatch Box as binding.
The important point here is that the idea that Parliament could force the Government to accept a bad deal will only incentivise those on the other side of the negotiating table to deliver just such a deal. As the Lords European Union Select Committee—hardly a Tory front organisation —said:
“The Government will conduct the negotiations on behalf of the United Kingdom, and, like any negotiator, it will need room to manoeuvre if it is to secure a good outcome.”