Geoffrey Trewenack was an architect who worked for Alistair Knox in the early 1950s. During this period he lived with his wife, Toni, in a flat on the Knox property in Eltham. Being a registed architect, which Alistair was not, he was able to sign off on the Knox plans as 'Supervisor', a requirement at this time.
A big, charming and relaxed man he fitted easily into the expanding Knox building and design evironment. Locals remember his mature Fiat 500, a car as small as Geoff was large, struggling up the hills of Eltham in first gear with the ever patient Trewenack confident in his cars ability to make it and, having reached the crest they descended at ever increasing speed only to keep repeating the exercise until journey's end was reached.
After Knox and Eltham he went into partnership with Kevin Borland whose architectural practise became Borland and Trewenack. His time with Alistair is evidenced by signatures on the architectural drawings of the period.