Two princes from the Royal House of Siam Prince Bira and Prince Abhas his brother who are to race for a trophy presented by Prince Chula of Siam in a special race which is a feature of the August Bank Holiday ( August 5th ) meeting at Brooklands are prarctising at the Surrey track for the event The race will take place on the mountain circuit Photo shows Prince Bira ( in the cockpit of the MC he is to drive in the special race ) chatting with his brother Prince Abhas before a practise run at Brooklands Prince Abhas is to drive an ERA July 31st 1935