He is asking you to simply give him authority without your knowing what he is going to be asking for.
My inclination would be to tell him that whilst you accept that he has terminated the agreement if he wishes to represent you without new terms being agreed then the terms under the old contract will apply until such time as the new terms are agreed.
I hope this helps.If there are any further points please reply
if he continues on the existing terms what happens to the 3 month notice period ? ie if he continues indefinately on the existing terms because new terms cannot be agreed then what is the notice period ?
This is really giving you the power to decide. You can take the view that the original agreement has terminated when the 3 months are up and simply continue the original terms on an ad hoc basis until new terms are agreed or alternatively say that since he is not in fact terminating the agreement at all because no fresh terms have been agreed it stays in place including the notice period and he will have to terminate again when new terms are in place if he wishes to continue being your representative. Soft ball or hard ball, your choice.