I’ll usually start with something as basic as Googling a phrase like “areas in [town]”. Somewhere on the first page or two – beyond the Wikipedia and local council links (which can be useful in their own right) – there will normally be some kind of message board thread discussing the pros and cons of different parts of town. While any single post should be taken with a barrel of salt (and there are usually completely contradictory opinions of the same area within the same thread), over time you’ll start to see patterns emerge. Which are the areas (or postcodes) where people always say
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