Latest person through would probably be the Combined Services Caving (Association?) [CSCA].
They went through about 2 weeks ago on a wet weekend, and bailed for about 1hour.
Prior to them, Probably Keith Mason and Lisa Wooton of the YSS, I think near the start of January. they Bailed the sump for about 1hr and a half.
After all the rain and snowmelt, I can assume that Bailing will be a given!
Whether there will be worms in or not will have to be a treat for you when you go and see!