The original Warrant gave the ribbon colour as red for the Army and blue for the Navy. With the formation of the Royal Air Force on 1 April 1918, the use of the blue ribbon was abolished. Living holders of 'Naval' VCs were required to exchange their blue ribbons for red ones. The colour of the ribbon might more accurately described as 'wine red' , claret or crimson.
Thank you goldfish & Fibonacci. I thought the ribbon was crimson too, but the clue asks for 6 letters. so looks like I'm going for claret, as the nearest colour to crimson.