I have come across new information. I have been informed by my grandfather's sister that she thinks their father wasn't Saunders but Herbert William Harris born in battersy London (spelling?

). He married first and had a daughter named beatrice then married in 1923 as Saunders to my great grandmother and had Jim, bill, Joan Edward and Peggy. 11 yrs later had molly. Jim, Joan and Ted were sent to warren farm (around 1933) when their father was imprisoned for bigamy. Peggy (diphtheria) and bill (polio) stayed with their mother.
Where can I find details regarding their placement at warren farm and/or bigamy records on line. Also, numerous Harris bmd entries - how can i ascertain a likely match?

?
thanks
mel