The British publishing house of Hart-Davis, MacGibbon was formed in 1972 by its parent group, Granada. The parent company had acquired the publishing concern of Rupert Hart-Davis in 1963 and the house of MacGibbon & Kee in 1968.
When Granada exited the publishing business in 1983, the imprint was sold to William Collins, Sons of Glasgow.
References
Hart-Davis, MacGibbon Wikipedia(Text) CC BY-SA