...was my first thought.
There appears to be, with no obvious explanation, a giant defensive structure in someone's back garden here.
Having looked it up, it seems that it's a "castellated Victorian water tower", built 1868, now turned into a residence. Fancy that!
Mr West said: 'In fact it was one of the first towers of its kind in Britain. It was built to provide water for the Cadburys and Wills and their retainers, including two gigantic family Victorian houses for the Wills. So it's in this exclusive gentlemen's residential area and as water towers go, it's posh.'
GPS Coordinates:
51.45304, -2.63822
Location: Long Ashton