Obviously it is a long time since the orignal query but still..

My great grandmother was an Ey (Amy Emmeline)

Your info re the marriage certificate was useful since it seems to clear up confusion I had, thinking Ann Ey was sister of Amos (Amas) Ey. Amos' 1860 marriage certificate states his father (John Christian Ey) to be a tailor. The family has a strong association with the Marylebone/Westminster area.
If anyone know if Ann and Amos were related it would be helpful