Not sure if you have the info you asked for by now as your message is over a year old.
I can confirm the marriage partner to Walter Copleston Ferneaux was Gertrude Amelia NASH.
Having recently purchased a very old sketch of Dean Vicarage, it contains some info on the reverse about Walter Ferneaux and his wife - called "Auntie Gertie" on the picture.
I am doing a little research into this picture, so if you would like a copy by email, please let me know :)
Tracy