Lieutenant Sir Henry Vassall Webster
Lt. Col. Sir Henry Vassall Webster (1793 – 19 April 1847) was a British Army officer, aide-de-camp to the Prince of Orange at the Battle of Waterloo.
He was the second son of Sir Godfrey Webster, 4th Baronet and Elizabeth Fox, Baroness Holland.
He joined the Army in 1810 and rose to lieutenant-colonel in 1831
In my opinion this site is the best source of uniform reference for the 100 days (Waterloo) campaign: