Conversation so far:
Where did Anthony McPartlin begin his career?
McPartlin's first appearance on television was on the children's workshop programme Why Don't You?
Was the show Why Don't You? the only show Anthony McPartlin was on?
His big break came when he rose to prominence playing the character of PJ in the CBBC series Byker Grove.

Question: Why was the show important to his career?
Self-contained rewrite: Why was the show Byker Grove important to Anthony McPartlin's career?