As birth of William Alfred Dudley was most likely illegitimate, this could be his mother
1881 census
Ellen Dudley b 1861 Barnet domestic servant with family of George Maile b 1821 St Pancras
Address 31 Queen’s Crescent, St Pancras
1891 census
Ellen Dudley b 1862 Barnet domestic servant cook with family of Frederick Bishop b 1847 Camden Town
Address Camden Road, St Pancras
Comberton