Hi Rosie and Sandymc,
That's great to find his parents so quickly. Very grateful.
Jane's father John MATTHEWS married Blanch BURT at St Nicholas, Deptford, Kent in 1821. Blanch was born at Long Sutton, Somerset c1797 but her parents are a bit elusive. She listed herself as a Cooper at Brentford after John died in 1851, and she may have died in Truro in 1886.
There are a lot of George TOMBS out there sadly. Is there a 'trade' directory for schoolteachers in London in early to mid 1800's? Wonder if James Henry TOMBS was a Gardener at a large estate, park, Kew Gardens,

The John MATTHEWS christened at New Brentford in 1795 is a possibility.
Difficult to be certain with a common name.
Rosie, my only dog (50 years ago) was a blue roan Cocker Spaniel called Holly, lovely nature, lots of pups, in Melbourne, Australia.
Thanks again for your help.
Regards ... Jim