Source for date of death: National Probate Calendar
Obituary from the Believer's Magazine Sep 59.
I've got a copy of Fereday's birth registration, which confirms 1866:
@Nick Fleet: I've been wondering about that too. What makes things even more mysterious is that in his father's case things are the other way round: He was born William Wooldridge Fereday in 1822, but in his later records, including the National Probate Calendar, the middle name is missing!