The Ralph Watson built Lycoming Special, competed in many events, driven by Ralph Watson initially then Bob Gibbons, Malcolm Gill, Forest Carden and...
I don't know about O, but E was "exempt", commonly used on farm machinery, racing vehicles and such. From memory you still paid the compulsory third...
The Vintage Car Club held a Gymkhana / Funkhana at a parking area back in 1981, at Takapuna Town Centre
Some Keith Humphries photos, Keith was there...