I think Martin could have done the odd cameo - didnt make sense that he wouldnt have anything to do with his son with all his traumas but wouldnt want to see "Curly" back, although kevin kennedy is still dining out on his erstwhile role.

If curly ever returns then so will reg holdsworth

I don't think there is any place for Curly on Coronation Street anymore, he has no real links there, even his best mate Kevin isn't around. I agree that Martin should have made a few appearances though with all that's gone on with the Plats since he left even just for the sake of continuity.