Donald Sinden(1923-2014)

When he first became a stage actor, his speaking voice was comparatively high-pitched, so he had voice coaching to lower it and make it more imposing and sonorous. When he later started acting in films, his modified voice was too deep for the young parts that he was auditioning for, so he had further voice coaching to raise it about an octave.

When I meet people they say "I thought you put that voice on for TV". But you can't put on a voice like this - you're just lumbered with it.