It's been a while since I played England (or MTW2, for that matter, due to comp problems) but I remember Inverness being fairly worthless as far as income when changed to a city. On the other hand, it's also the worst for transporting troops from, being further away from almost any front. It also grows slowly making it slow to upgrade (then again, a high chiv governor can fix that).
I think of those three Nottingham will make the most money as a city, but would also upgrade the quickest and provide the best troops.
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