I remember watching an old episode of the Avengers, in that particular episode it took place at a lighthouse, I didn't realize that she was the same actress from Goldfinger..she was pretty smoking, as John said she aged gracefully.
"Governments may think and say as they like, but force cannot be eliminated, and it is the only real and unanswerable power. We are told that the pen is mightier than the sword, but I know which of these weapons I would choose."~Sir Adrian
I am reasonably certain she is riding an Ariel single, the 350 or 500. I had one from the late 40s and recognize the fork tightener knob and the compression release and spark advance levers on the handlebar. They were nickel plated and had a distinctive shape.