IO540
These “VFR only aircraft” are not VFR only. True, you need special permission from the UK, but all are IFR capable under South African rules and even the good old CAA have granted special status to the UK reg examples so all can compete on an equal status. If you think the TB can win against these home constructed aircraft give it a go...
Rod1
PS all the aircraft trying to brake the record are side by side two seat designs.