The practice of Alfred Hugh Mottram was continued by his son James Arthur Hugh Mottram who had served part of his apprenticeship with Dunn & Martin and became a partner in 1950. In 1954 the younger Mottram took Thomas Edward Patrick, a friend from Edinburgh College of Art, into partnership; and in 1960 their long-serving chief assistant Andrew Martin Dalgleish also became a partner. The practice title then became Mottram Patrick & Dalgleish.

In 1968 the practice amalgamated with that of Donald P Whitehorn to become Mottram Patrick Whitehorn Dalgleish & Partners and some time later Mottram Patrick. In the same year Ronald Drylie was taken into partnership.
[Source: Dictionary of Scottish Architects http://www.scottisharchitects.org.uk/]