Quoted on the Guardian Media site today, Barry Norman says in a recent interview:

“People started coming up to me saying, ‘And why not?’ and giggling. I was always baffled. I never said it! Rory Bremner said it when he was impersonating me on his Channel 4 show. I still defy anybody to find a programme where I did use it…”

Writing in 2003, Barry Norman ‘said’:

“And Why Not?”

Not entirely unkeen on the phrase, then.