Please explain this...because I'm way beyond fascinated right now.
You want to be married, right? So by getting married, your civil union is automatically dissolved (at least as far as Canada is concerned). It's not like you have to go out of your way to do anything difficult, and it won't cost you so much as one extra penny.
I would assume that being able to get married is more important to you than having a civil union, which is why you were inquiring about it in the first place. So if you know that you CAN get married, and nothing's stopping you, then what is this inexplicable attachment you have to your civil union classification?
I'm not in a similar situation, and there was no offense taken.
If you're both going to be living in Canada, why does it matter to you what the UK does with their marriage or civil union laws?