From Wikipedia, the free encyclopedia. Alistair McGowan (born 24 November 1964) is a British impressionist, stand-up comic, actor, singer and writer best known to British audiences for The Big Impression (formerly Alistair McGowan's Big Impression), which was, for four years, one of BBC1's top-rating comedy programmes - winning numerous awards, including a BAFTA in 2003. He has also worked exten...