The 1960 Marcos GT Xylon is being offered for sale this weekend by Silverstone Auctions.

Only nine Xylons were built by Marcos, which was founded in 1959 by racer Jem Marsh and engineer Frank Costin.

Sir Jackie came to drive the car in 1960 after he was invited to test the vehicle at Oulton Park. He went on to win four sports car races in the Xylon.

The auction estimate is between £35,000 and £50,000.

The vehicle has been in storage since production ceased at the marque's Wiltshire factory in the 1990s.

Silverstone Auctions managing director Nick Whale, said: "It's fantastic to be offering this car for auction for the first time in its life.

"Jackie Stewart is one of the country's most legendary racing drivers and therefore it's apt that we are offering it at the home of British motorsport."

"This is a truly great piece of motor racing history which I can't wait to see restored and racing again soon."

The auction is being held at Silverstone racing circuit on Saturday and Sunday.