Back to the debate about gas turbine-powered racing cars, another one (that I didn't know about) popped up on an Oulton Park FB group I'm a member of, as it competed in the 1968 Gold Cup meeting (and the BOAC 500 at Brands).
The US-made Howmet-TX sports prototype. Driven in the UK by quite an interesting character called Hugh Dibley.
But looking that up then led to another discovery...
The equally US-made STP-Paxton USAC (indycar), designed by Ken Wallis, a relative of a certain Barnes "bouncing bomb" Wallis.
So they *are* out there, not just the much better known Lotuses and BRMs.