Hi Shelagh,
This may help discount one William,
Marriage
William Spooner MITCHELL Dec Q 1847 Wortley
Death
William Spooner MITCHELL Mar Q 1885 age 67 Wortley
1861 census, William S MITCHELL born abt.1817 Penistone, living with wife Elizabeth and children including a daughter Lavinia in Peniston.
Regards
Daisy