The Cockpit.

The cockpit is a landscaped amphitheatre by the Serpentine in Hyde Park. It was the site of the first big open air rock concert in the UK back in the '60's, when the Rolling Stones performed.

The Stones did a historic 50th anniversary gig in Hyde Park last summer but that was a much bigger affair, over near Park Lane.

I wasn't there but I can remember it.