hahahaha, the word 'Bugger' comes to mind.
I think it would be a good idea if you postded up the fine though, otherwise you may never catch him. Regardless of him being another Line owner, he was doing nearly double the speed limit with your plates! I'd be pissed.. Plus he's making shit worse for the rest of us line owners in the way of cop trouble..
~Thats just my 2 cents.