I'm sure there used to be loads of KLF references in Viz back in the day, 1991-92, but can't remember them. The below (joke) letter caught my eye this month, though, in their Letterbocks section:
"In these days of economic hardship, is anyone else wondering whether 90s shouters KLF are regretting burning their million quid? (Scruffy Harry, Bookham)"
Made me smile! :-))