Thanks for flagging this up - I bet it was during the intense rainfall during the small hours of Monday 2nd November. (My gauge, at low level, had collected 63 mm in the 24 hours to 06-30.) This amount of rain, on the tail end of an already wet week, hadn't really been expected and it caught many of us out. As the flood peak was overnight, it seems unlikely anyone will have been lucky enough to have captured this one on camera. By the way, Hurtle and Jingle Pots (Chapel-le-Dale) also overflowed in the same weather event, also inferred from the grass afterwards.
Out of interest, how wide would you say the strip of flattened grass was, down valley from Hull Pot?
Incidentally there is a detailed account of Hull Pot overspilling in a certain book published in 2017 - but I'm sure you're already aware of that.