I enjoyed the programme very much, but I'm a bit confused as at what record they actually broke? Surely HPV and upright bike records are separate categories, no?
I was contacted by BHPC chairman Alan Goodman (who has an uncredited role in the programme as "Observer in red waterproof"), IIRC during my time in the Gulag, about 24-hour records in general and multi-rider HPV records in particular. I couldn't find any reference to the latter but was able to point him at CTT and UMCA. The latter organisation is the one that sanctioned the Fedrigon/Gremley record they were initially aiming for.
UMCA will happily accept records for any class of machine, though I believe you have to be a member to set one. There was a move afoot a few years ago to unify UMCA/CTT/$HPV road records, but I don't think anything ever came of it.
Careful study of teh R00lz leads me, and others, to believe that a UMCA member could ride the Mersey Roads 24 on/in anything human-powered...