I know Lumley more for her appearance with David McCallum in Sapphire & Steel. It was only ~10 years ago that I saw "Ab Fab" (and I didn't finish watching the entire series. It's OK, but not one I'll revisit often).
I watched OHMSS a couple of nights ago (this thread made me want to watch it...
OHMSS has always been one of my favorite Bond films with Lazenby being my second favorite Bond (right behind Connery). It's my second or third most watched of the Bond films.