Thanks lytebyte2002, I shall peer outta the window - probably just about see them from Croydon! It's a bit grey that way though...
Re the single engine stuff, I have heard in the past that if a BBMF Spitfire or Hurricane loses the engine during a flypast over London, they must ditch in the Thames - Spitfires are buggers to ditch and could well prove fatal for the pilot, not sure about the Hurricane.