Good stuff ERC, Ray,
1973 - had started a couple of years before doing speed events in an 848 cc Mini.
Only mods 4.5 inch ( x 10 ) reverse rim Cooper S style wheel made by Dunlop [ same rim and centre ] -centre reversed to make the offset different to go over the drum brakes. Made them look like widened wheels ..
My results were not as good, but huge fun.