Okay, maybe it's just me being American, but I finally have to say it bothers me that you're spelling the word as 'defence' instead of 'defense.' Since neither is wrong, however, I can't really tell you what to do.
I'll stick with Defense
<img src="http://img245.imageshack.us/img245/5185/googlesix0.png">
And that's why
Defence = British
Defense = American
I don't really care, but I prefer Defence.
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