Iain Murray, the columnist and blogger better known as "The Edge of England's Sword," has been dismissed from his workplace. His blog was given as cause, even though he had previously been given permission to do it. It's also worthy of note that none of his organization's procedures or policies for discipline were followed in this case.
First things first. Please head over to Iain's blog - especially the tip jar.
Second: as blogging becomes more high profile, this sort of thing is unfortunately something to keep in mind. Blogging has helped some, and hurt others. If you're a blogger, consider both your position and your protection... and secure both.
Finally, Iain, go see a lawyer. From here, it looks like your employers have left themselves open to action on this front. You owe it to yourself to find out for sure, and most lawyers will do the consultation for free.
Best of luck, friend.