From Karsten Stelk archives - unsure of the meeting but the 100S is in the background with WAC247 a 100/6 or early 3000 in two of the photos.
The car was destroyed in 1964 and the engine and some parts were put into several other 100S according to Joe Armour
Karsten has more photos which he will post and has allowed me to " borrow " them.
and finally a group of 100S, a 100M and a 3000 or as believed by some one of the prototype AH 4000's ;
from JME Healey archives Goodwood 2009.