Sellers released his first studio album in 1958 called '' The Best of Sellers '' ; a collection of sketches and comic songs , which were undertaken in a variety of comic characters . Produced by George Martin and released on Parlophone , the album reached number three in the UK Albums Chart ; The same year , Sellers made his first film with John and Roy Boulting in '' Carlton-Browne of the F.O. '' , a comedy in which he played a supporting role for the film 's lead , Terry-Thomas . Before the release of that film , the Boultings , along with Sellers and Thomas in the cast , started filming '' I 'm All Right Jack '' , which became the highest grossing film at the British box office in 1960 . In preparation for his role as Fred Kite , Sellers watched footage of union officials . The role earned him a BAFTA , and the critic for '' The Manchester Guardian '' believed it was Sellers 's best screen performance to date . In between '' Carlton-Browne of the F.O. '' and '' I 'm All Right Jack '' , Sellers starred in '' The Mouse That Roared '' , a film in which Jean Seberg also appeared , and was directed by Jack Arnold . He played three leading and distinct roles : the elderly Grand Duchess , the ambitious Prime Minister and the innocent and clumsy farm boy selected to lead an invasion of the United States . The film received high praise from critics
BAFTA
13th British Academy Film Awards
Peter Sellers