Stuart, I have an excellent book published by the Science Museum in 1970: "The Light Car, a technical history" by C. F. Caunter, SBN 11 290003 8.
Photos, drawings and lots of text all about light cars, cycle cars, bubble cars, micro cars, minis, 2CVs, Renault 4s etc. It might be possible to find a copy on eBay or check with the Science Museum archive.