I thinks what Roy is getting at is what I have said in an earlier post. The RCN and UNISON are both big fans of AfC as it benefits the majority of their membership, they are encouraging members to return a Yes vote.
Unfortunately for us they are the two biggest unions in the NHS.
As you may note the Unions had a big hand in negiotiating the terms of AfC, I imagine Unison and the RCN probably dominated the staff side representations. It is not in their interest to reject something that they had a hand in developing.