Our President in 1978/79 was:

Magnus Magnusson

He proposed the Toast to Sir Walter at our 71st Annual Dinner on Friday 2nd March 1979 in The North British Hotel, Edinburgh

Read the text of his address here

Magnus Magnusson, KBE born Magnús Sigursteinsson; 12 October 1929 – 7 January 2007) was an Icelandic-born British based journalist, translator, writer, and television presenter. Born in Reykjavík, he lived in Scotland for almost all his life, although he never took British citizenship. He came to prominence as a BBC television journalist and was best known as the presenter of the BBC television quiz programme Mastermind, which he hosted for 25 years. He is also known for his famous catchphrase "I've started so I'll finish", which he said whenever the time ran out while he was reading a question on Mastermind. 

Text source: Wikipedia