Floor armour in a Griffon.......colour it gone. It is 600 lbs (somebody correct the weight for me: it has been a few years since I've flown with it) of useless weight. Not that I am not concerned about the FE's and soldiers in the back, but it isn't going to do jacks^&* to protect you. Take a look and the pictures of the helicopter shot up by small arms in Iraq. There are a f*(&$ of a lot of holes through the sides and very few in the bottom. From personal experience in Kosovo I can say that, while we never actually got hit, all the shots taken at us would have come in the front or sides.
Anyways, that's my 2 cents worth of rant.