The Division Bell I don't know about the recording, but it's the same recording used for the 4th wedding in the film "Four Weddings and a Funeral", which was also released in 1994. it's important to note that's it's NOT the same recording which was used on their song "Fat Old Sun", from 1970.
The single tolling bell was (I believe) a bell cast especially for making the album. Because aging rock bands can afford to do things like that. Certainly a bell was taken on tour with the band after the album as it can been seen being played on "PULSE", the concert film from the tour.
The album cover is, like most Pink Floyd album covers, a non-composite image with no trick photography. 2 heads were made for the shot, both about 1.5m high. Forced perspective makes them look much taller. A good friend of mine who's local to the area has told me that farmers have problems with avid Pink Floyd fans trying to find the exact field which was used for the shot - a hard thing to do as the landscape is quite flat and barren in that part of the world.
Ironic that Ely Cathedral doesn't have a ring of bells.