Thanks Beg for the info, it has been a great read!
So this link, Obituary
http://www.rootschat.com/links/0u7w/ confirms Thomas Frederick's father as George Morley, along with the other info it is safe to say that this is correct.
This also says he leaves behind four sons, Gordon (my great grandfather), Sydney, Irvine and Thomas Frederick and one daughter Rhoda Kate, which matchs with BDM records.
I have no birth record for Thomas Frederick born in 1853 so I cannot confirm where he was born, I was told New Plymouth from another family member but it could possibly be Nelson going off the un-named record which would match everything up.
SO is it safe to conclude that George Morley of Nelson was Thomas Frederick's (born 1853) father?