Les has only served as a director of Les Company in Manchester and Rolls-Royce Company in Derbyshire. He devoted the rest of his life to the design of Rolls-Royce, and his influence in the company continued unabated. When Rolls-Royce 193 1 successfully acquired its competitor Bentley, Les even relentlessly demoted the former manager W O Bentley to the London showroom of Rolls-Royce as a sales assistant. Les was a member of many British mechanical engineering, electrical engineering and aviation engineering organizations. In addition, he was elected as a Fellow of the Royal Society of Literature and Arts on 19 19, and was awarded the medal of the Society of Automotive Engineers on 1930. In order to affirm his work in aviation engineering, 19 18 was awarded OBE by the British court, and 1930 was further awarded the hereditary slave baron, with Sidon in Rutland as the fief.

Les died of illness at his home in West Witering, Sussex, England on April 22nd, 1933, at the age of 70. After his death, his body was buried in the cemetery of Orwellton parish church in his hometown. Lord Delhi of London, then Minister of Air Force, immediately sent a message of condolence behind Les, saying that his death was a great loss to the development of British aviation and praised his cooperation with the Air Force during his lifetime. Since Les died childless and had no heir, his hereditary title of Baron was cut off. On June 6th, his estate was appraised as 1933, with a total value of112,598 pounds and 8 shillings.

In order to commemorate Rice's achievements, many things in Britain are named after him, including the Royal Hall and the student dormitory of Louvre University. The Queen's Gate Shopping Center in peterborough once named one of the parking lots as Les Parking Lot, but the old name was removed after the renovation of 20 1 1. Westminster Abbey in London also installed a stained glass in memory of Les on the north side of the nave on123 October, 1962+05438 to mark its contribution to Britain. 1977, Sir Henry Royce Memorial Foundation was established in Britain. Since 1992, Sir Henry Royce's memorial lecture has been co-organized with the Institute of Practical Engineers as a memorial to him in the engineering field.