Publishers for this title are as follows. This is based upon copies I have access to.
Annuals #1 (1951) to #9 (1959): Hulton Press Ltd.
Odhams purchased Hulton and renamed itself Longacre.
Annuals #10 (1961) to #12 (1963): Longacre Press Ltd.
In 1963 Odhams and Fleetway were merged into IPC but until 1969 retained the use of their original names. After 1969 they used the IPC Magazines name.
1964 & 1965 unknown but probably Odhams Books Ltd.
1966-1968: Odhams Books Ltd.
1969: for Odhams Books by The Hamlyn Publishing Group Ltd (Hamlyn had been purchased by IPC in 1964)
1970 to 1972: unknown
1973 to 1975: IPC Magazines Ltd.
some of the above information provided by Jay Flash.