Besides building Topcat, it turns out there is still another car that is no less unique than Bill Carter ever constructed in 1987: G-WHIZ. Both are made using a Jaguar V12 engine with a radically cab-forward design.
But it is slightly different because the G-WHIZ comes with two striking jet engine units in the back (it's unknown whether it also works) and is equipped with vertical and horizontal stabilizers like an aircraft.
And all driveable day-to-day vehicles rather than relatively non-functional show cars. Indeed, it is hard to believe all Bill's cars have been certified for use on a public road in the UK and used by the creator for travel.
Source & Images: Trussty