I had the honour & pleasure of meeting Sir David when he was a founder & director of TVAM. In the 1980s a courier/ cab company I managed 'had' part of the TVAM Account & was given its own desk there to handle bookings. It was manned by us 24/7 & I was one of those who worked there. I had the pleasure of meeting most of the TVAM people & remember that Sir David was most friendly & always said hello. (Yes, he did use the phrase "Hello, good evening & welcome" in a self-mocking way!).
I remember him more though for his early years in the 1960s. He truly started TV satire with the wonderful TW3 (That Was The Week That Was) & its successors. As a young man, I gladly came home early on saturday nights to see the wonderful sketches & debates & to watch Barker, Corbett & Clees in their early careers & the lovely Millie Martin too . Halcyon days!!
A sad loss.