Gilliat was posted to Australia in 1953 to serve as Military Secretary to the Governor-General of Australia, Viscount Slim and in 1970 served as a pallbearer at Slim's funeral."Heath at Funeral of Lord Slim", The Guardian, 23 December 1970, p. 4. Gilliat was appointed a Commander of the Royal Victorian Order in 1954 after his assistance during the Australian visit of Queen Elizabeth II and Prince Philip, Duke of Edinburgh during February 1954.
