@Peter Hyde wrote:

Thanks for the response, but here in the UK I know nothing of these books. So what are they titled, and why are they good?

Peter, they have great photos, just as excellent explanations of manufacture. In fact great reference all around. They are also pricing guides. I bought a couple for my wife and will try to complete acquiring the series.
I’m pretty sure you could find them at the convention near Chicago next month. Take a bird across the pond and meet us. I’ll buy you an American beer. 😉
p.s. I know much easier said than done. If the convention were in London, we couldn’t afford the trip.