From his Foreword to the book:

"His presence…was certainly both audible and visible.  His laugh – famously loud and unmistakable – echoed round that huge and labyrinthine building [Television Centre]. And he was seen everywhere in it – in the corridors and in the conference rooms, in the canteen, where he chose to eat rather than in the more select senior staff dining room, and, for a few minutes most evenings, in each of its eight studios."