Dave Brown's version shows Liam Fox lying on the ground with a big hole in his foot. On the left, we can see UK Prime Minister David Cameron, covering his face with his hand in a gesture of despair (the Fox affair has been a big embarassment to Cameron and the Tory party). On the right, Fox's friend Adam Werrity (wearing his 'best man' suit) says, "...and that's how the Werrity patent blunderbuss facilitates more accurately shooting oneself in the foot".
1. A blunderbuss is an early form of shotgun.
2. If you shoot yourself in the foot, you say or do something stupid that will cause you a lot of trouble.
Reports suggest that Mr Werritty's lavish lifestyle and globetrotting at Mr Fox's side were funded by rich business figures with interests in defence companies—hence the comment about the 'patent blunderbuss'.