we exchanged a few words with the legendary "Gus" Walker (having been carefully briefed to shake his (remaining) left hand.
If I may intrude into this hallowed thread, I've a footnote of which the Gus Walker dit above reminded me.
I was presented with my Wings by Sir Gus, when he was (just) still serving, and we were all briefed as above. There was some confusion as Sir Gus was used to the
unbriefed, and would proffer his left hand reversed (thumb downwards) so a right hand could shake it.
His shake was a powerful pumping action too! I recall introducing my then young lady to him at the post-parade reception, and watched her handbag handle bouncing down her arm and onto his! They still let me keep the wings though. . . . .