During my research for my wife's family I came across a John Fidler who I think matches the one you were researching.I don't know if you managed to get all the information you wanted. It is a long time since your post which I only came across today. I have in my possession a photo of John's children. Lizzie,Emma,May,Florie,Rosamund,Patti,Willie. I understand he had also at least 4 more children not in this photo,namely Robert,John,James,Hannah and Ruth.
I think John was known as Jack.I have another photo of son Willie (Bill) who died at age 19.On this photo it states Uncle Jack's,Elizabeth Dobb Fidler son William died 19 years of age. I also have the death record of his son John at age 4 months.
I also have the newspaper cutting of John (seniors) death which names all the mourners including a number of the Dobb family.
John's sister Martha Fidler married a Charles Edwards which is where my wife's family line took me.