This picture was taken during the production of the episode 'Arrival.' How do we know this? Well No.6 only carried a black and white umbrella once, and that was during 'Arrival.'
McGoohan "I warn you Tom, I'm extremely difficult to light."
Tom "Don't worry Pat, You're lit!"
But isn't that the Prisoner standing there wearing his grey charcoal suit? No, you're not seeing double, but it is McGoohan's stunt double Frank Maher standing below the man lighting McGoohan.