He died in March 1991 from an infection after a heart-lung transplant. A packed memorial service was held at St. Mary's Catheral in Edinburgh, near Haymarket.
Stirling University postumously awarded Matthew his Computing Science degree, and named a remote access computing laboratory after him in Murray Hall.
Whenever I hear or think of the poem Clancy of the Overflow by Banjo Patterson I think of Matthew. Matthew's mother had spent time in Australia when younger and missed the country, and it was one of her favourite poems. Matthew and I once spent some time going through the library to find the poem, and type-set it and sent it to her as a present.
There are passages in Terry Pratchett's The Last Continent that refer to a character called Clancy, and I can't read them without ending up thinking about Clancy of the Overflow, and thence thinking of Matthew.
I recently discovered that Clancy wrote a Reply.