Bluebottle is an adenoidal squeaky-voiced Boy Scout from East Finchley (the same neighborhood of London where Peter Sellers grew up).
He was noted for reading his own stage directions out loud, and was often greeted with a deliberate round of applause from the audience ("Enter Bluebottle wearing string and cardboard pyjamas.
Splutmuscle: A fly-paper.Four shows later, in the episode "The Greatest Mountain in the World", the script refers to "Peter (Bluebottle)".
In later seasons, no request or response was needed: Bluebottle's entry into the show would generate a loud, sustained applause by itself.
After a while, the character began to anticipate this fate, noting at the appearance of a dangerous prop that "the dreaded deading" is approaching.
In an interview with Michael Parkinson, Sellers described trying to keep a straight face while talking with a large red-bearded Scout leader who nevertheless spoke in a falsetto voice and had an ingratiating manner.