Hi there, this could be a classic detective case in modelling. There are very few coloured photographs of Brave Borderer, the Vosper Craft MTB, but, there are several excellent models of her around. Not becoming confused with the Perkasa model, or real vessel. Some of the models of The Borderer show a dark grey deck. Also, they show a green deck. Now, the class of vessel which preceded was the dark class such as Grey Archer P1041. There are coloured photographs of the real vessel in existence and they show a green deck. So, having said that; I would suspect some time in her life she may well have had a green deck when you were actually serving on her.
John