Elementals

Woodchester looks as though it should be haunted so it was bound to attract one or two reports over the years, which it did. However, the very few that predate the Ghost Club visit are not consistent with each other. I therefore don't believe there is a credible case to be made for saying the place is haunted, by an elemental or anything else. I'm sure others will disagree.

The grounds at Woodchester have a far better quality of evidence for hauntings than the house, which as you point out is more difficult to pin down.