While we're on the subject of Reed failing to turn up for engagements 1 2, it would seem germane to mention this famous anecdote related by Derwent May, former literary editor of the Listener (1965-1986) and the Sunday Telegraph (1986-1989):
This story gets repeated in Reed's 1986 Guardian obituary, and I had originally seen it told with Douglas Cleverdon, Reed's frequent radio producer, as the one who was stood up.