I studied your system before coming here, and hence am aware of the context.
If your referee now sends the predicted grades, would Manchester reconsider?
P.S: This happened with me last year - my referee did not have the ability to give predicted grades apparently. None of my universities rejected me solely because of that, as far as I'm aware.
hate the current system of fairy predictions of grades, which schools dishing out A* predictions, while in others you have to sell your soul to Satan for an A* despite similar ability/achievement - would like to see applying for unis after recieving grades ....