I think I read somewhere that Fitzroy switched sides... in fact I've just remembered where. It's in a book about Lewes... just hunting it down .... 5 minutes later... got it. He first stood as a Conservative and then became a Liberal (no dates), became Lord of the Admiralty in 1845. if it's not online elsewhere I'll look at the Times obituary. It's bloody useful having discovered that I can access that. Do you have a library card for your local authority?