I was not present at the meeting I read about between the ERG and the Chief Whip as I was speaking on the advantages of leaving when the meeting was said to have taken place.
It is quite clear there is no UK Parliamentary fix that the government could offer to make the Agreement acceptable. The whole point about the Withdrawal Treaty is it will override anything the UK Parliament might want to do in future were we stupid enough to sign it.
I assume those ERG members who were present will have the same view as I do that the current Agreement is unacceptable and would take a lot of amendment by the EU and UK working together on it before they could consider voting for it. I would go further and think it would be best to observe the words of the Conservative Manifesto which said a Future Trading or Partnership Agreement has to be negotiated in parallel with any Withdrawal Agreement.