In the early 1900s Mallam’s was run by a grandson, also Thomas, and a cousin, Frank Mallam, as well as an unadmitted clerk, Fred Grimsdale. Following his qualification with articles Grimsdale became a partner in 1927, and the ﬁrm prospered under the name Thomas Mallam, Grimsdale & Co. Two mergers then occurred, with the Thame ﬁrm JP Cave & Co and the Oxford ﬁrm Reeves & Haynes.
The Herbert & Gowers element of HMG traces its origins to another Oxford solicitor, Andrew Walsh, who practiced as Andrew Walsh & Co at 116 St Aldates from shortly before the First World War. He featured heavily in representing Bliss Mill of Chipping Norton when the Mill went on strike in 1913 – 1914, appearing in the magistrates’ courts to defend allegations of assault perpetrated by management employees (in at least one of them the opposing advocate was George Mallam). Other clients involved substantial land owning and banking families. But his principal client was one William Morris, later the ﬁrst Lord Nuﬃeld and founder of Morris Motors Limited based in Cowley. As Mr Morris’s legal advisor, Walsh was instrumental in the development of the Morris business, and later its charitable foundations including Nuﬃeld Hospitals and Nuﬃeld College.