P237 CEEFAX 237 Wed 3 Feb 21:00/11    Knock, knock Who's there?  Sid. Sid who?  Sidown and have  a cup of teaN     Knock, knock   Who's there?   Alfred. Alfred who?  Alfred your needle   for you.    Knock, knock  Who's there?   Alison. Alison who?   Alison to the radio  every morning.   