In 1914 he married Marion Forman. They had a son Rodion in 1915 but were separated a few years later.During World War I Basil was awarded the Military Cross for his service in France. Unfortunately his younger brother, John, was killed in action.

After the war Basil continued his work, touring with the New Shakespeare Company where he was given many top roles including his favorite of Romeo, in Romeo and Juliet. In 1921 Basil made his film debut in The Fruitful Vine. Despite his success in film, Basil's love for the stage was to continue throughout his entire career. After the opening of a Broadway hit The Swan in 1923, Basil met Ouida Bergere they married 3 years later and would prove to be a devoted couple.

Basil's many films included rolls in David Copperfield (1934); A Tale of Two Cities (1935); Captain Blood (1935); and Adventures of Robin Hood, The (1938).

Unfortunately it was Basil's appearances as the "definitive" Holmes that would typecast him into a role he would never be able to leave. In his autobiography, Basil states,
"Had I but one Holmes picture... I should probably not be as well known... But in myself as an artist, I should have been well content."

Basil passed away on July 21, 1967.