Thanks eveybody for the help. Unfortunitely that alfred seems to have died in 1922 so thats not him.
I believe her name may have been recorded as kate edwards in 1911.
The only guaranteed mention we have of mary kate is her birth and baptizimal, after that she disappeared but the 1911 irish census states her parents had 8 living children meaning she was still alive and older relatives use to talk about her and its believed she lived in england.
The registry office i believe was in birmingham and its simply called the birmingham registry office.