Dumfries, the seventh Marquess of Bute, was born John Crichton-Stuart but raced under a pseudonym to hide his title. He was also known as Johnny Bute.
Dumfries won the British F3 title in 1984 and tested for Ferrari in 1985 before joining the Lotus F1 team the following year as Ayrton Senna’s team-mate but he was dropped after one season after finishing just five races with a best finish of fifth place.
A move into endurance racing saw him win Le Mans 24 Hours event with Jaguar in 1998.
“The indomitable spirit and energy which Johnny brought to his life will be greatly missed, and the immense warmth and love with which he embraced his family,” said a family statement.
“His heart was firmly rooted on the Island of Bute where he spent much of his time.
“He was a moderniser and an inspirational thinker, transitioning a family home to a progressive, working visitor facility and estate.”
Additional reporting by Press Association.