Ian Richardson's fabulous 'Moonraker'.  A wonderfully engineered machine which made your hair stand on end when it was fired up.  It was powered by a very unusual Butterworth 2-litre flat four. Butterworth were an engineering firm who built these engines for formula road racing cars.  They were based on four 500cc. Manx
Norton motorcycle cylinders mounted on a custom built crankcase. Butterworth topped this off by discarding the Norton push rods and rockers for their own overhead cam assembly.