Green Satin was fitted on the Victor (and I assume the other two V's)*. The aerial type was known as a "Janus array" after the Roman god, as it was alternately "looking" forward and backward to measure the doppler shift. As I recall it was removed sometime c. 1974 and replaced by a more modern bit of kit whose name I forget, but which was smaller, lighter and more efficient than Green Satin.
*Thanks for the confirmation, Ian, you answered the question before I posted it!