Bit of a hot take but I think Borley's been massively romanticised by paranormal enthusiasts and it's actually just an example of a derelict building getting more attention than it deserves. Harry Price was a brilliant investigator by the standards of the 1930s, but some of his methodology was questionable. The "most haunted house in England" tag came from him, and he had a vested interest in it being genuinely haunted because it's better for the book sales, innit?
The house was built on an old monastery site (bonus spooky points), it was badly constructed and maintained, and it had structural problems that would cause all sorts of noises. I'm not saying nothing happened there, but I reckon 80% of the reports can be explained by dodgy foundations and overactive imaginations.
Change my mind?