I found this information on the BOB website relating to the "blue" one. Not navy colours but post war posting to singapore!

LINK

.

So it is. 

I should have looked there in the first place really.

Quite a good website here about the Dambusters raid and 617 Sqdn:

http://www.dambusters.org.uk/index.htm

Nice link for the BoB memorial flight, cysgod-du.  Extraordinary that:

At the end of its development the Spitfire carried an engine producing more than twice the power of the original, its maximum take-off weight and rate of climb had more than doubled, its firepower had increased by a factor of five and its maximum speed had been increased by a third; all this in essentially the same airframe.

That really goes to show what a fantastic design that R J Mitchell had in the Spitfire.  A real shame that he never lived to see the success of the aircraft, dying of cancer in 1937 at the age of 42.