The Battle of Britain Memorial Trust (who, after all, ought to know about such things) suggest that you're a couple of months too late!
http://www.battleofbr...nmemorial.org/events/
Never mind, there's other things to celebrate our Britishness on September 15th. How about the opening of the Liverpool to Manchester Railway in 1830? Can't get more British than a railway and Wiliam Huskisson was killed, run over by a train, at the opening too, so we can commemorate that as a bonus.