Posted: Fri Mar 07, 2008 2:58 pm-
First, make sure you sign it.
I have a friend who has both American and Canadian citizenship. When traveling to and from the US, he uses his US passport, but when travelling nearly anywhere else, he uses his Canadian passport, because he's had better 'service' (so to speak).
I'd recommend that, if you were travelling in the EU at all, use your UK passport. It'll be easier, and you can avoid customs. But if you're travelling through North American, probably use your Canadian passport.
Also, remember, you can't carry two passports at once. It's illegal. People do it, but they really, really hide the other one, and don't carry it on their person.
I dunno if that's what you're looking for, but hope it helps.