I've gotten an email back from the Warwickshire Yeomanry Regiment Museum and they also seem to think that the medal ribbon has a high chance of being the Queens South Africa Medal. They found out that a Charles Henry Sykes served with WYR for a while and also was awarded the Queens South Africa Medal.
I'm having a look at all of the GREEN'S seeing as the photo came with everything else that belonged to Elizabeth Gayton Green and her family (Green).
So you don't think this photo is from WWI? you think it's from the Boer War?