I had a look at this again over the weekend and found my grandmother,amelia Hatton, in Croydon in 1911,she's with my aunt also called Amelia,however no sign of Silas(again).
My Gt.grandparents John and Margaret are there too,also in the Croydon area.
I did find a Silas Hatten,but the age doesn't tally,could be though,his age fluctuates a fair bit,it's the right area too.