In 1775 he took part in the negotiations between Leicester House and Pitt, directed against the duke of Newcastle, and in 1757 in the conferences between the two ministers which led to their taking office together.
The French foreign minister, Delessart, believed that he would checkmate all the efforts of the emigres at the continental courts provided that he could confirm Pitt in his intention of keeping England neutral.
Pitt received him cordially; and to Grenville the envoy stated his hope that the two free nations would enter into close and friendly relations, each guaranteeing the other in the possession of its existing territories, India and Ireland being included on the side of Britain.
Glover (" Leonidas ") attended every performance; the duke of Argyll, Lords Cobham and Lyttelton, Pitt, and several other members of parliament testified their admiration.
In 1761 he became personally known to Pitt, who, recognizing his ability and discretion, once and again made use of his services as private amanuensis.