I can’t confirm which specials are on this CD, as I don’t have it myself yet – it’s hard to get hold of. The references I’ve found all say “four specials”, then go on to list ISIHAC Meets Charles Dickens’ A Christmas Carol, Humph in Wonderland, the 30th Anniversary Special, I’m Sorry I Haven’t a Desert Island, and In Search of Mornington Crescent. This, by my count, actually makes five! However, the thirtieth anniversary special wasn’t a Special in terms of the content. It was basically a regular show just aired outside the normal broadcast run to celebrate the show’s longevity. So perhaps it’s four Specials and a special.