Captain Captain Augustus Frederick Keppel, 5th Earl of Albemarle Viscount Bury
Bury was commissioned an ensign in the 1st Regiment of Foot Guards on 7 April 1811. He was promoted to Lieutenant and Captain on 12 January 1814. In 1815, he was appointed aide-de-camp to William, Prince of Orange and fought at the battle of Waterloo.
In my opinion this site is the best source of uniform reference for the 100 days (Waterloo) campaign: