Finished after 3 coats of wash and bry brushed twice
The first wash that I used was the Citadel Miniatures Gryphonne Sepia colour wash, then dry brused with Tamyia dark yellow.
Next I did another wash, this time using Devlan Mud and Humbrol Matt Sand.
The effect still wasn't quite what I wanted, so I again washed using Devlan Mud and dry brushed with Matt Sand.
I then added mud around the wheels and bottom of the front and back using a Humbrol brown paint (no idea of the name, there is just a number now).