Danny Pink
From Tardis Wiki, the free Doctor Who reference
Danny Pink was a teacher at Coal Hill School, where he taught mathematics. He had previously been a soldier, and established the Coal Hill Cadets at the school. A pupil once asked if he had ever killed anyone.
He was introduced to Clara Oswald by Mr Armitage. She later asked him to join her for a drink and he embarrassed himself. (TV: Into the Dalek)