Hello Jean, are you still researching your Garnetts in Alverstoke Portsmouth Hampshire UK?
The Garnetts I am researching are on my maternal side, my grandad being Richard Garnett b.1895. But I am at the moment looking for my Great Grandfather George Garnett(born 1858)his correct birth record, I have yet to find it, and confirm who his parents were, I believe they are William b.1812 and Caroline b.1819, this is going by the 1891 census (Alverstoke)this also shows George had a brother James aged 35 b.1856. What makes me sure this is the right one is that his future wife Mary Cousin/ens is visiting next door on the census, too much of a coincidence, but that makes him born 1853, so you can see my confusion. But the strangest thing is that I have managed to get his death record for 1918 (Alverstoke) which tied in with his employment record at the Portsmouth Dockyard, they gave me his birth as 12/03/1858 and death as 1918, also just to muddy the waters a little more on the 1911 census he is a John George, maybe he did not like the name John, but that makes finding his birth record harder, also I have not had any luck finding his marriage date.
I have yet to visit Portsmouth Archives, as George was a Mate/Master Mariner at some part of his working life. I saw your message and thought there may be a connection in some way, have you got any further with your research and found out any more?