In 1768 Hay was selected by Newcastle as candidate for Lewes, after having given an assurance that he would follow Newcastle in Parliament. A fortnight later Newcastle changed his mind; his relations in Sussex were uneasy at the choice of Hay; it would be ‘a perpetual exclusion of all of the name of Pelham for the future’;
Hay voted with the Opposition in Parliament, but there is no record that he ever spoke in the House. He was described by George Hardinge as ‘a modest, virtuous, respectable, and sensible man; with no brilliancy of talent, but with a high sense of honour’.
He died 9 Feb. 1786.
