Found a bit more on the Quantrill's of Finchley. Herbert Robert Quantrill's father's marriage certificate of Herbert George Quantrill, Butcher, and Isabel Kate Freeman, Parish of St. Martin Kentish Town in 1889. Frederick Robert Quantrill and Elizabeth Quantrill were witnesses, Robert Quantrill was his father and a gamekeeper.

Looks like Herbert George was born in Sturston, Norfolk. Any information on this family would be greatly appreciated as I cannot find them in the 1881 census!!