In that one remaining scrapbook there are some very yellowed Spagthrope advertisements. I was thinking of trying to analyze the heraldic symbols on the Spagthrope coat of arms that was the firm's logo in the ads. Can anyone recommend a good reference book? I’m particularly puzzled by what appears to be a codpiece.

By George, I think you've got it! I had heard that some of the adverts were cocked-up in the printing, and if I'm right, what you have is one of the rare existing examples of this error. What appears to be a codpiece is, in fact, an upside-down rendition of Julian's pride and joy, a moustache bra of his own invention. The hirsute lord devised this appliance with nostril protection in mind, which indeed makes it look like a more private accessory when you view it inverted. (Unkind stories spread among the factory workers joke about a mishap with this bra that allegedly sent the lord to the hospital with minor brain damage from oxygen starvation, but there may be a grain of truth in this - it may explain Julian's obsession with developing a fully-submersible motorcycle for the Royal Navy).

So you might want to mount those yellowed pages with care, perhaps sealing them in nitrogen gas and putting them in a mildew-free environment. It might be amusing to mount a photo of a Spagthorpe upside-down next to it, and see if people make the connection between the "codpiece" and the stylized moustachios that comprise part of the pinstripe detailing on every Spagthorpe motorcycle.