Once the new switch turned up I contorted myself into the foot well to change it. To do this I first removed the red cruse switch which just turns 90 degrees and pulls out of the bracket holding it, once this was out I did think about trying to unscrews the grey switch from the bracket but this would have been nearly impossible so then removed the bracket. This is held on by 1 x 10mm bolt, its a really fiddly job to get to but once I had it loose I actually found it better to get out of the foot well and sit on the floor with my back to the car door then reach back and undo the bolt blind, this sounds silly but it was much easier. Once the bolt was out the switch comes out with the bracket, you can then just unscrew it and swap the new one in.