I do not really have a name for mine but most times I drive my 110 defender it's on the way to work and back on the M20/M25 so I feel like i am going into battle, hence she is refered to as The Battle Bus.
I was watching a bit of the Lord Mayors show on TV the other week and noticed with interest that the army do a roof mounted machine gun for the defender. not sure what the part number was and B.Part dont stock an OEM on yet. might make the M25 a bit fun fun though