I'd like to think of Menzies Campbell as Gandalf...

As for the song, I think its certainly trying to make a valid point (I am English, but raised in Scotland - so I know about anti-English feeling and ideas of nationhood) but you're trying too hard.

There is a song on the last Bert Jansch album about 9/11, and as much as I love Bert Jansch the song is rubbish. Trying to say too much, too obviously in songs just doesn't work. It's much better when you allude to something without it being completely obvious.
That is the reason why the early Dylan stuff is so good. It can be taken a number of ways.

Even something like 'Masters of War', which is obviously dealing with the Cuban Missile Crisis, never mentions anyone or anywhere by name, which makes it much more powerful. Dylan back then asserted that his songs weren't 'protest' songs at all, which kind of backs up what I'm trying to say.

Sorry, ended up rambling a bit there... I hope you get the idea anyway.