Philo retired from the SIS in 1978. In the period 1978-1983 Philo wrote a post-1945 history of the
Secret Intelligence Service, which is described as "a work of formidable scale and scholarship" Philo carried out a wide variety of activities in his retirement. • Extended Interview Assessor on a part-time basis in the Home Office Unit of the
Civil Service Selection Board between 1978 and 1990. • Wrote articles for
The Dickensian between 1980 and 2001. Tony Williams, in his obituary of Philo, stated: "A man of great intelligence, integrity, loyalty, an inspirational colleague and friend, Gordon Philo's was a life of service to his country, and his enthusiasms." • Member of the
Athenaeum Club, London which he joined in 1976, and in 2001 wrote an article about an aspect of its history connected to
Charles Dickens. • Philo left a legacy of £350,000 to the
Royal National Lifeboat Institution and an unstated amount to the
British Library. ==Publications==