Teignmouth never took his seat in the Irish House of Lords, nor was he elected a representative peer after the union. He was twice examined before the House of Commons on Indian affairs, on 18 June 1806 and on 30 March 1813. In consequence of the order of the House of Commons for Teignmouth's attendance on the first occasion, the House of Lords on 19 July 1806 passed a resolution maintaining the privilege of peerage as apart from the privilege of parliament. This resolution, however, was not communicated to the Commons; and on the second occasion the order of the Commons for Teignmouth's attendance was not questioned by the Lords.