Only When I Larf is a 1968 British comedy film directed by Basil Dearden and starring Richard Attenborough, David Hemmings and Alexandra Stewart. It is adapted from the novel Only When I Larf by Len Deighton, and features Attenborough as an exbrigadier con man in a variety of guises.
It received mixed reviews, including a plodding adaptation and praise for its sound, unfussy direction and witty, observed thesping.
Source: Wikipedia