I have been searching the UK 1901 census on line and have managed to find Elsie Stevenson's family in Leicester - names of members of her family tie up with the witnesses to her marriage to William. Unfortunately, none of the records for William Giddings seem to tie up with the information I have on the marriage certificate. None of the men of that name recorded in the 1901 census are the right age. It would seem to indicate that he came to the UK after the census and before his marriage in 1909. There seems to be no way of finding out whether he was American or Canadian and I don't know where to begin with those countries' records.