Fascinating stuff. I was told that Naff (as in Naff Off etc.) derived from Naafi, at least with respect of prison slang, supposing Clement & La Frenais did their homework! One wonders when it became generally pejorative - which was the sense I used it in earlier. I come from the North East of England (South East Northumberland as was, North Tyneside as is) though I no longer live there. I remain a fan of South Park, as I have been since it was first shown in the UK - some of the funniest TV ever to come out the States.