Thank you Andrea and Vesta,
The information that I know about Charles Henry Trevanion is that he was a British army officer. His wife was Lydia Francis, his son also Charles Henry was born at sea in 1835 probably when they were travelling to the New World ie Australia or New Zealand, but I can find no record of him in NSW although his son was married here in 1863. I will try looking up UK archives for army records.
Thanks again to you both