My fast deteriorating memory of Gray's is that it flogged fuel and cars and was on the left hand side of the High Street going towards Chatham. I hired a car from them once then they blamed me for a broken rear light when I returned it. I hadn't done a real close up of it's condition when taking it.....
I'm afraid that's the sum total of my experiences of Grays.
Thanks for the update though.
AlanH.