Fascinating thread!
Saltburn is one of my most favourite places in the country. I don't personally see what's weird about the details in the OP, except maybe the morgue - but that end of the town was once notorious for smuggling, which was likely a high-risk pursuit (either being a smuggler or having smugglers as an enemy), so they went for practicality rather than tucking it away somewhere hidden - especially with those hills.
I've read the whole thread and I'm sure I must have missed it, but I can't yet find any mention of Totnes. Shurely shome mishtake?!?!
Whitby is definitely up there, but I suppose the whole Dracula thing was always going to give the place an atmosphere.
I also agree about Beddgelert; the only thing, though, is that all of these eerie-vibe places are the ones I love most - don't have me scarpering at all!!
I would also add:
Penmon Point (Anglesey)
Happisburgh (Norfolk) - just the lighthouse and caravans on the edge of the coast now, as obviously easy to move at short notice before the next chunk of cliff drops off. I think it also has one of those wartime 'pillbox' shelters too, doesn't it, as well as all of the previous barrier attempts (in vain) to try to keep the sea at bay?
Much as I dearly love the beautiful Peak District, a lot of it is a bit eerie and other-worldly - especially Bakewell, Castleton and Youlegrave (and Eyam, as has been said already). Every time I go there, as we drive into it, I automatically (totally subconsciously) find myself humming the League of Gentlemen theme music! Yes as well to Buxton, just over the PD boundary. In fact, if you look at a map of the PD, it's as if, rather than just not including Buxton in it, somebody has deliberately gone to the effort of excluding it, by drawing the map juuust around the town boundaries so as to say "No, you're very close, but you're still not one of us!"
Scrabster and Dunnet Head - I don't know if it's partly the feeling of having crossed all the way through the bleak, misty Highlands and eventually reaching the edge of the world itself (well, Britain)!
Keswick
Corby
Burnham Beeches is well creepy, too (although the cafe is outstanding!). It's strangely owned by the City of London and has a strong police presence there. We received a letter in the post from the police about two weeks later, after visiting, telling us that our car had been seen with a bag on display that could have attracted thieves and warning us to be more careful and crime-aware next time. It was only a carrier bag with a coat in it, IIRC. It very much seemed like the warning wasn't about the bag at all - just to 'let us know' that we were being watched - like finding a horse's head in the bed! Maybe that's just me being paranoid.... There are lots of tales of mysterious goings-on there, some more plausible than others - involving UFOs and allegations involving a former Prime Minister.
I know what PP meant about Watchet in Somerset - I was irrationally freaked out by the existence of a museum dedicated to Bakelite (which is 'niche' in itself), but which was across a field right on the edge of the village. I'd have thought no more about it if the same museum had been in the middle of a town/city, but I just really can't see how much trade they would get. I might have to start another thread about weird, random museums! There's also a link with the Knights Templar in that area, which adds historical interest/intrigue.
As for Roy's of Wroxham, it does seem a strange stranglehold that they have on the whole town (Royxham?!). The first time we went there, we went on the boat tour of the Broads with our DN and I still remember the guide 'amazing' us with the startling revelation that the Roy's presence was actually in neighbouring Hoveton, not technically Wroxham, "So, it should actually be known as Roy's of HOVETON!!!!!!!!!" This seemed to amuse him no end and had him chuckling for a good few seconds like the Hooded Claw.