What context did he talk about it in? I can 100% see him mentioning it, knowing it was likely bullshit...on the other hand, I can also see him coming across it, forgetting the source, being reminded about it years later and treating it as legit.
Alright, I found which book he wrote about this. It's a little embarrassing; especially after that goddam noun thing the other day, but I'm a big boy and can admit my mistakes.
It's from pages 84-86 of Cosmic Trigger Volume III, and
he cites his source immediately. So, yeah. But! his source ended up being Fortean Times, which isn't exactly the most reliable source. Fortean Times allegedly cited the Coventry Evening Telegraph, from February 24 1994, for the story. On top of this RAW says that in February 1995 he heard on KPIG 107.5 that the clowning was continuing.
However, as to how much he believed, or didn’t… I was thumbing through the rest of Cosmic Trigger Volume III, and he peppers the book with several stories throughout which strain credulity, clearly as an exercise in his favorite topic: “model agnosticism”.
And, Nigel was absolutely right, as usual, because none of that information came up to me when searching on the web for it.