[2] Experience in local rep at the Oxford Playhouse encouraged him to move to London, where he made his West End debut in Julian Slade and Dorothy Reynolds' 1957 musical Free as Air.

Waller was also associated the Open Air Theatre, Regent's Park, but always looked forward to the times when his work took him on location further afield, including Rome, India and Scandinavia.

[2] An excellent pianist and an ardent lover of classical and choral music, Waller was extremely knowledgeable on the subject of oratorio and sang with Anthony Bowles' Actors' choir and the BBC Chorus.

[2] Waller continued to stay in touch with the theatre during the final years of his life, touring successfully with Barbara Windsor in Joe Orton's classic black comedy, Entertaining Mr Sloane and appearing in a musical version of Beauty and the Beast at the Manchester Opera House, in 1998.

[2] Despite his television fame, Waller never lost his affection for Yorkshire, taking great pride in retaining both his accent and his many friends within the Huddersfield Choral Society.