I can also access the Encyclopaedia Britannica and the Oxford Dictionary of National Biogprahy through the library membership subscription and the later has a biography for him, but it is cvopyright so I can't post it. It says "He joined the Peelites, was quite close to Gladstone, and ultimately became a Liberal" - no dates. I can't access Britannica at the moment due to "high traffic levels" or so it says. Erm.. there may be some question as to the date of his death. The DONB gives 22 December 1859 as does the Wikipedia article, but I am looking at an edition of The Times from Tuesday 20th December 1859, which states "We deeply regret to announce the death of the Rt. Hon. Henry Fitzroy ... on Sautrday last ..." - that would mean he died on 17th December 1859. Unfortunately there doesn't appear to be a full obit. In the edtion for 17th Jan 1860 there is a report of the unopposed election of his successor on 16th January, 1860, one John George Blencowe (apparently maternally descended from another former Lewes Liberal MP Sir. Francis Poole who sat as the MP 100 years before (or so the article says)