Books like The Man from the Diogenes Club

I found this book after reading Newman's excellent contribution to The Fair Folk, which also features an agent of the semi-governmental supernatural investigation agency The Diogenes Club. However, that's the only connection; that short story was set at the turn of the century and this collection is set in the 1970s and later. I prefer the early setting just as a matter of taste, but Newman does a good job with not only the setting but the feel of the 1970s. Several of the stories reminded me of tv programs from that period, especially the little-known "Sapphire and Steel". I wasn't happy about the way the sequence took a couple of chronological leaps, the first I think three years or so and the second over a decade! There seemed like plenty more adventures that could be written, why rush to pension off your characters? I was frustrated that Vanessa disappeared. Did she retire after suddenly (view spoiler)[getting married to some guy that we never met at all (hide spoiler)]