Gravestone of George Tovey and Sophia Tovey Bostock, St. Andrew's Old Church, Church Road.
The inscription reads: George Tovey born 1787 died 1858. Sophia Tovey Bostock born 1800.
I've had a dig through BMD and census records with very little success and I can't find out what relation Sophia was to George - possibly they were cousins or even siblings. Records do show that Sophia died in the 3rd quarter of 1865 in Brighton.
The 1851 census throws up one possible sighting of George and Sophia at 54 Cambridge Terrace, Paddington, St. Marylebone. George is described as a widowed visitor, born in Scotland and a Colonel in the Army; there's an entry at the same address for a Sophia T. Bostock who is described as the married daughter of the head of household, Sophia Hirby.
You can see more gravestones and memorials over at this week's Taphophile Tragics.