my great-grandmother, Ellen Warren, born in London July 26, 1846, married my great grandfather, Nicolas Clement Brandenburg, born in Liege December 2, 1849. The marriage took place in Liege January 30, 1875. The parents of Ellen Warren, Joseph Warren (musician) and Charlotte Hall, residing in Bexley, Kent County, they have given their permission for the marriage by the notary William Webb Venn, in London (date of act: June 26, 1874). Can anyone help me find this act? In advance, thank you.