Whilst he didn’t leave Granada outright he left very shortly after Granada Reports moved to Liverpool. I think a number of presenters were still commuting from Manchester also.
Tony Wilson did quite a bit out of Liverpool, I think, because when they moved they installed Tom McGurk as the main news presenter but he didn't work out so they parachuted Wilson in quite quickly. There was a documentary about him on Granada when 24 Hour Party People was released and I remember the editor at the time paying tribute to how good he was at dealing with all the new technology, and that he was "the ultimate video news jockey".
He did say that when he was working in Liverpool the local kids spent more time driving his car than he did, mind.
nwtv2003 and Inspector Sands gave kudos