This indicates the lack of exact detail attached to the claim (as it was in fact George Rose's father David that was said to have been Marchmont's illegitimate son).

He left office with his colleagues in April 1783, but in the following December he returned to his former position at the Treasury in Pitt's ministry, being henceforward one of this minister's most steadfast supporters.

In 1801, Rose left office with Pitt, but returned with him to power in 1804, when he was made vice-president of the committee on trade and joint Paymaster General.

[6] Rose resigned these offices a few days after Pitt's death in 1806, but he served as vice-president of the committee on trade and Treasurer of the Navy under the Duke of Portland and Spencer Perceval from 1807 to 1812.

[7] He was still Treasurer of the Navy under Lord Liverpool and MP for Christchurch, a seat he had held for 28 years, when he died in 1818 at Cuffnells, his house in Lyndhurst, Hampshire.

Rose was also a friend of King George III and his family who stayed with him a number of times at Cuffnells on their way to summer holidays at Weymouth.

The elder son, Sir George Henry Rose (1771–1855), was in Parliament from 1794 to 1813, and again from 1818 to 1844, and in the meantime was British minister at Munich, at Berlin, and at Washington.

He was the father of Field Marshal Baron Strathnairn who was described as one of the bravest men in the British Army and the best commander in the Indian Mutiny.