Bernard Unett in the 1968 F4 Vixen.
 
Vixen Cars were based in Cheshunt in Hertfordshire and built cars for the F4 series in the late 1960s. Their 1968 Hillman Imp powered car dominated the BP F4 Championship taking the first 6 places and for 1969 they announced their new F4 car would also be raced in F3. It was to be a spaceframe design with conventional suspension and a wedge shaped body. Vixen stated that they were looking for a top-line team to run it, apparently there were no takers and by July they said the car was nearly ready to race and would be pedalled by a well known F3 driver. There was no indication who the driver was and no record of the car actually taking to the track.