In July 1968 , two possible theme tunes for the programme were composed .
In July 1968 , two possible theme tunes for the programme were recorded by Delia Derbyshire , but these were rejected and a piece of jazz music used instead .
In July 1968 , two possible theme tunes for the programme were composed and recorded by Delia Derbyshire , but these were rejected and a piece of jazz music used instead .