Westbury also drove the Ferguson P99 in the 1964 Brighton Speed Trials and at the First International Drag Festival, a series of six events held in England that year, where the car covered the standing-start quarter mile in 11.01 seconds.
Westbury tamén pilotou o Ferguson P99 no Brighton Speed Trials de 1964 e no First International Drag Festival, unha serie de seis eventos realizados en Inglaterra ese mesmo ano, onde o coche cubriu o cuarto de milla inicial (402 metros) en 11,01 segundos.