Back in the 80s and 90s Denis was a partner and the leading scriptwriter at my father's firm and I was in awe of him, always.
The obituary quotes him expressing somewhat regretful sentiments about the rise of the word processor, but it is as an unlikely champion and early adopter of such technology that I will remember him. Long before the company had a room full of Vydecs, Denis had his own little handheld WP, of which he seemed immensely proud.
Before proper fame came with It'll be Alright on the Night (V could never cope with the way he held his clipboard or notebook - awkwardly - at his waistline), he used to host a mid-afternoon slot with a panel of retired and forgotten celebs who competed to guess the origins of clips from black and white movies of the classic 1930s musical era. Whenever at home pulling a sickie from school I'd come across this unwelcome interruption in programming aimed at my own age-group, and wonder who on earth could possibly be interested in this sort of nostalgia for wrinklies!
He must surely have been the last of that great generation of British comedy writers and performers that came out of the forces at the end of WWII.