I am not a Biddulph myself but my mum's best friend at school was Stephanie Biddulph, they're both in their 80's now and still the best of friends. I have done a lot of my own FH and when Steph mentioned that she'd love to know more about the Biddulphs I volunteered to help.
This is what I've managed to compile from BMD indexes, the IGI and census forms, it may not be complete.

Steph's father was Edgar George Biddulph b.20/04/1891 in Walsall, his siblings were Elizabeth Maud b.9/07/1888 Finedon Northamptonshire, Walter James 9/2/1890, Agnes Caroline 31/12/1892, Clara Minnie 1895, Bertha 1896, Elsie 1898,James 1901, Louisa 1903, William 1905 and Howard Holland 1907. Apart from Elizabeth all the siblings were born in Walsall.

Their parents were Joseph Thomas Biddulph b.1865 in Rushall Staffordshire and Louisa Holland (1870, Finedon Northamptonshire).
Joseph Thomas had siblings Elizabeth Maria c.1867 Rushall, Agnes Lilly c.1869 Rushall, James Howard (Howard)26/08/1872 Walsall, Edgar c.1874 Walsall, Walter William (William) 12/10/1879 Walsall and Clara Maud 11/12/1881 Walsall.

Their parents were James Biddulph b.1838 Lichfield and Susanna Fereday b.1839 Bilston.
I am now stuck and can only guess from now on.
James Biddulph had parents Joseph Biddulph and Elizabeth, the only Joseph and Elizabeth on the IGI that married at the right time were married 5/11/1832 in Tamworth but I can't find a suitable Joseph baptism anywhere.
I don't live anywhere near Staffordshire so I was wondering if any Biddulph researchers out there can throw any light on it.
Regards
Annette Hughes