Hi Maiden Stone
Thank you for your comments and suggestions

First of all, let me say I am sure Anthony is an ancestor. He is the brother of my great grandmother Hannah McEntee nee McLane. Anthony is in the 1871 census with the family listed as scholar so I know of no other occupation.
I had not considered before now the possibility that he may have used his mother's maiden name- Murphy in an effort to escape. I am assuming, although I dont know anything about these things that being courts martialled in this period would have been shameful and made it difficult to obtain a job.
I hadn't known about the spelling variations to the extent you are discribing ie M' Mack as a middle name and 30+ variations. I will follow this up.
I also hadn't considered the possibility that Anthony may have gone to Scotland and under a false name. He did apparently enlist fraudulently so its certainly possible he has deliberately changed his name

The search continues!
Karen.