He was more R33 than R34 (although they were substantially similar) but you might find bits of use in the Lord Kings Norton archive.
Lord Kings Norton of Wotton Underwood
Cranfield University library has a lot of airship material (hardly surprising when you consider the ancestry and locality), and is worth visiting if you're not too far away. I've always found their librarians very helpful when I've asked for help.
Quite often on eBay or the like a book called "Airship: the story of R34" by Patrick Abbott, published in 1973, comes up and has a lot of photographs in it, as well as line drawings. That's worth tracking down (actually just search on "R34 airship" on eBay and you'll be surprised how much comes up.)
G