Brian,
Thanks. I have already been through that site and have been in contact with Dave Homewood, the chap that runs it. No further forward unfortunately.
Have also downloaded the 100 Sqn ORBs and annexes which cover the period 1934 - 1941, from the TNA site. No details recorded in those documents either.
Have looked through pretty much all the material on the 'Beest that I can find on the 'Net.
Aviate1138,
Sorry, cannot answer the question re Spit props/hubs.