I'm also quite near Pluckley - it's not that
interesting a place though (aside from the pubs, as mentioned above!). Plus, if you were looking for a place to investigate, it'd be more interesting to have a less well-known one, in my opinion.
When I was a kid I was taken on a holiday to the Norfolk Broads, and there's some odd ghost-related places along there. Burgh St Peter near Waveney sticks in my mind in particular, as it has a rather odd-shaped church (looks like it's made of building blocks) which is supposed to be haunted by the devil.
Aside from that, the Isles of Scilly (about 23 miles off Land's End in Cornwall for those who don't know) have fascinating places to visit, and are very picturesque too. The prehistoric burial chambers, wreck sites, standing stones (particularly the Old Man of Gugh, which has a real buzz, but there's things everywhere), the Valhalla Figurehead Museum on Tresco (with figureheads retrieved from real shipwrecks), it's very atmospheric. It's also a good place to go to get away from cars. (Edit:
I made the stained-glass pacman visible in my avatar there too.