General Sir Hope Grant, (brother to Sir Francis Grant PRA) who would have known Gough well, died without children, it is possible that  Francis Grant gave the porrait sketch to him.

It is possible that the backdrop to this portrait shows part of Wimbledon Common  which was part of Spencer's manor of Wimbledon. In 1864, Spencer, as lord of the manor of Wimbledon through his ownership of Wimbledon House, attempted to get a 

This portrait is an early 19th Century portrait painting after the portrait of John Wesley by John Jackson, RA, 1778-1831 currently in the Museum of Methodism, John Wesley's House London. This portrait is signed and dated "C P Monson 1851".