Very nice. It makes me wonder though what rules were bent/ignored or broken to allow the single engined Spits/Hurri over London? Normal CAA rules, IIRC, most definitely prohibit this. Don't get me wrong, I'm glad any such rules were ignored/bent or broken but I recall not so long ago a Harrier was supposed to take part in a London flypast and this was disallowed on safety grounds because it only has (sorry,
had 
) one engine.
PPP