Chris Gould’s A Guide to the ’65’ and Nippy – through the Austin 7 clubs, ebay etc.
excellent Speedex site – cars and tuning here
Good catalogue of new and re-manufactured A7 parts (Seven Workshop) here
Bob Bryan review of lighting MOT requirements 1931-1936 (Morris) cars here
Good complementary wiring diagrams for the Seven (one from the Nicholson book; one from Dorset Austin 7 Club)
Huge list of Technical tips from Dorset again here (care, does not print well unless you reduce the scale)