Photographing a plan from a book would give false measurements. I couldn't afford to go to Reading for the task anyway. Looking into their facilities, I am guessing that most of their material is historical information; with names, locations and dates being the prime research for visitors. The museum holds lots about the censuses; plus family, military and rural histories and so I think they expect visitors to take written notes for their research. That is something that I had been doing for about 40 years, I researched maritime subjects and note taking was very much part of my research.
Trying to build a model truck, with the various contours of the chassis; the bolt-on and welded plate locations and wiring etc., need a diagramatic plan, with dimensions. Hopefully, someone here will have such a copy, or point to an affordable source. Buying books, just for a single page containing a plan is also out of my reach.
cheers,
Mike