Hello Netty, he appears to be of the family of Royds of Falinge (BLG 1965); a James Clement Royds of Prior House, Haydon Bridge, Hexham, Northumberland, management consultant, was b. 1958; the 1958 Surrey N.W. birth record of a James C. Royds gives his mother's maiden name as "Cooke". The 1965 volume has Clement Michael Charles Royds (b. 1931), Lt, 5th Dragoon Guards, as having m. 1956, Victoria, elder dau. of R. C. Cooke, of Copseham Rise, East Horsley, Surrey. This is the only Royds/ Cooke marriage in U.K. records that I could find, taking place at Surrey S.W. Other issue Radcliffe P. (b. 1961, Northumberland W.) and Sophia L. (b. 1964, Northumberland W.). C. M. C. Royds's sister, who m. 1952, has "issue, two sons and one dau" listed, so I'm not sure why his own aren't included, given the preceding edition was 1952; nevertheless, this seems to be the only option given the records.