8th October 1953 for the start of the London to Christchurch (New Zealand) air race.
As a sideshow one could take a trip over the Thames and Hampton Court in a DH Rapide for 15/-, which I did.
I have a photo taken at the time which can be seen here:
http://groups.msn.com/TonyHawesRAFSe...to&PhotoID=726
Tony