G E ALDERSON really is a puzzle. One idea you might follow up is something that occurred in my branch of the ALDERSON tree. One of the sons, just like G E, had a falling out with his father. He left home and used his mather's maiden name for the rest of his life - but I don't think he changed hsi name by deed pole, just by usage. If this happened in G E's case then perhaps his mother was an ALDERSON not his father.
It may be that The National Trust, the current owners of Sudbury Hall, have records relating to G E. The Wellingborough connection figures large in his life. He married there. He lived there when he left service. He seems to have been in service there after discharge from the army through injury. Was he also in the service of the Vernons in Wellingborough? Was he in the service of the Vernons before WW1. He would have needed good references to get a job as valet and/or butler in such an important household. He did he get references when he had left the family home.
I hope these ideas might be of help. I f I come across anything I will let you know.
Albert Alderson webmaster for the Alderson Family History Society www.afhs.org