Nicky,
My last Vobe is Ann Vobe married to John Chamberlain. Ann was born in 1733 in Cradley Herefordshire, so you might want to look there for where your family was before London. Do you have any family that went to New Zealand? Recently someone sent me the name of a person researching Vobe there. Ann's brother Thomas had a lot of children so you might be descended from him. He died in 1810.
E Harrison