Well, if one can call shaky camera footage "proof".
Anyway, I was sent this video, showing off what apparently was the work of the Bog Roll Man who lives under Priory Park.
From what I can gather, it's a plunger surrounded by candles. Like a religious ritual of some sort. Odd? Certainly. But where would a maniac who dresses in loo roll buy candles? Would they serve him in the shops dressed like that?