Conversation so far:
What is the Borley Rectory?
Borley Rectory was a Victorian house that gained infamy as the most haunted house in England after being described as such by psychic researcher Harry Price.
What happened at the Borley Rectory?
A series of paranormal events and apparitions appeared at the Borley Rectory starting in 1863.
What type of hauntings were there at Borley Rectory?
An apparition of a nun, phantom coach driven by headless horsemen along with bells ringing, lights appearing in windows and unexplained footsteps marked the hauntings Borley Rectory.
What else did Harry Price say about the Borley Rectory?
Harry Price recounted that one of his helpers made contact with the spirit of a nun, Marie Lairre, who was murdered at Borley Rectory.

Question: What were his experiences?
Self-contained rewrite: What were Harry Price's experiences at the Borley Rectory?