Lord Uxbridge

Henry William Paget, 1st Marquess of Anglesey, KG, GCB, GCH, PC (Lord Uxbridge)

Sir Henry William Paget, 1st Marquess of Anglesey, KG, GCB, GCH, PC (Lord Uxbridge)

Commanding officer of the Allied Cavalry Corps, and second in command after the Duke of Wellington
Lost his leg to a cannonball in the final stage of the battle, during the Allied advance after the French Imperial Guard had retreated.

Uniform:

Henry William Paget, 1st Marquess of Anglesey, KG, GCB, GCH, PC (Lord Uxbridge)
Lord Uxbridge is often portrayed wearing a busby this might be correct for the Peninsula Campaign, during the Waterloo Campaign however he wore a shako as is shown in the picture above.

In my opinion this site is the best source of uniform reference for the 100 days (Waterloo) campaign: