My 2 pence...
As I am also dragging myself through a similar situation, I found the best thing was to call the embassy. British embassy was great(and has been on a few queries), and i assume Canadian should also be very informative.
Today I stood in the British Embassy in front of a large picture of HRH The Queen and read my sworn declaration that I wasn`t, or haven`t been married (oh, the memory brings a tear to my eye) in order to get a lovely piece of paper (88CHF) to show I am single...and why do i need this......so I can register as the father of my child.
Though I have no idea why this was needed, I would say this is the right thing to do, as soon (just 2 more forms to get.....), i will be the legal parent - otherwise our (my common law partner&I) child would be sent to her parents if anything happened to her.
But I did wonder how complicated it would be if I was already married/separated. how many forms would i need then?
fromage.