I communicated with Norman for the last twenty years or so when I took up P4 and then 0gauge modelling. On the basis that if you could see a piece of kit in a good photograph, then it ought to be visible on a good model - and Norman's photographs were models of clarity. I can't think of many locos that he couldn't find me a good photograph of and as often as not they were not the 3/4 front that so many photographers like but modellers don't always find especially useful.
Latterly he told me that he was recording class 86 and 87 electrics - though I don't think that it included following them overseas!.
RIP Norman