<P> The programme's scoring is completely nonexistent . Similarly, in rounds such as "Sound charades", where one team of panellists have to guess the charade of the other team, the answer may be obvious (usually a pun) but the opposing team pretends it is cryptic and they have no idea and deliberately guess wrongly . </P> <P> In rounds in which the panel must not see what the audience sees, there is the "advanced laser display - board" (actually a sign with the answer written on, held by Jon Naismith), sometimes described in more elaborate terms and "so generously funded by our hosts" but these of course do not exist: they are conveyed to "listeners at home" by the "mystery voice", alluding to the 1960s radio programme Twenty Questions . </P> <P> A regular feature on the programme, preceding the game Mornington Crescent, is a fictional letters section which begins with the chairman's comments ("I notice from the sheer weight of this week's postbag, we've received a little over no letters" and "I see from the number of letters raining down on us this week that the Scrabble factory has exploded again"). The invariably single letter each week is from "A Mrs Trellis of North Wales", one of the many prompts for a cheer from the audience, whose incoherent letters usually mistake the chairman for another Radio 4 presenter or media personality . "Dear Libby" (she writes), "why oh why...very nearly spells YOYO", or "Dear Mr Titchmarsh, never let them tell you that size isn't important . My aunt told me that, but then all my new wallpaper fell off ." </P> <P> The chairman introduces the show with remarks such as: </P>

I'm sorry i haven't a clue correspondent from north wales