Learn more about Southsea over at Wikipedia.
Info online leads me to believe this is a cenotaph
I am a big fan of Ancestry.com. I've been a subscriber since 2000. I use it for my personal research and also for people I want to know more about.
I found a passport record from October 1919 for Arthur and Anna, which includes his photo. This is most likely the trip in which she died.
Also at Ancestry.com are the following:
[Not sure if you can see without a subscription]
Their home at this link.
Anna's photo [Anna Ruth Jarman]
Anna & Arthur's photo
There are many more links to records, like census, for this family. I sure wish I could find my family this easy.