He inherited the barony of Manton on the death of his father in 1968. He was given Houghton Hall, the ancient seat of the extinct Barony of Langdale, by his maternal aunt Countess FitzWilliam , eldest daughter and co-heiress of Lieutenant-Colonel Philip Joseph Langdale, who from 1956 was the wife of Thomas Wentworth-Fitzwilliam, 10th Earl Fitzwilliam. With her husband's home, Wentworth Woodhouse, near Rotherham, Yorkshire, being the largest private residence in England, and with his second seat of Milton Hall, Peterborough, being the largest house in Cambridgeshire, also at her disposal, she may have felt little need to retain Houghton for her own use.
From a young age, Watson was a successful jockey having won 130 times as an amateur. He won the Kim Muir Chase at the Cheltenham Festival in 1955 riding Gay Monarch. Following the example of his father, who had established a stud at Plumpton Place in Sussex, he became a successful owner and breeder of racehorses. In 1970 he was a director of Thirsk Racecourse in Yorkshire. From 1970 to 1975 he was a member of the Horserace Betting Levy Board, created to divert monies from bookmakers to the racing industry. In 1982 he was appointed Senior Steward of the Jockey Club, becoming effectively chief executive of the British horse racing, which term ended in 1985. As Senior Steward he led the campaign to allow betting shops to show televised races. Manton was a steward at several racecourses, Doncaster, Beverley and York Racecourse. He was a Tattersalls Committee member and between 1985 and 1991 he chaired the York Race Committee. In 1998 he entered a horse he bred and owned, Silver Stick, in the Horse & HoundGrand Military Gold Cup at Sandown Park. His son Miles was the jockey and won the race. When the Queen Mother presented Manton with his trophy he told her: "I saddled the horse; I bred the horse - and the jockey."
Fox-hunting
He was Field Master of both the Belvoir and the Quorn Foxhounds and was a "well known" hunter in Leicestershire.
Marriage and children
In 1951 he married Mary Elizabeth Hallinan , elder daughter of Major Thomas Francis Dennehy Hallinan of Ashbourne House, Glounthaune, County Cork, Ireland and aunt of John Magnier the Irish billionaire business magnate and leading thoroughbred stud owner, son of her twin sister Evelyn Hallinan. They had two sons and a daughter who were triplets and two elder daughters.
Death & succession
On his death on 8 August 2003 the title passed to Miles Watson, 3rd Baron Manton, his eldest son. Miles was formerly a successful amateur jockey and was an officer in the Life Guards.