An appeal to find a vintage family car which was stolen from a motor show has gone global.

The Comet: The green classic TR4a was stolen from the showThe green classic TR4a was stolen from the show (Image: Archant)

The TR4a green Triumph was stolen from the public car park at Knebworth House, which was hosting the Knebworth Classic Motor Show and Vintage Fair on Sunday, August 24.

The soft-top car, which has an estimated value of around £20,000 and has a registration of JL8 00D, had been in the family for the past 44 years.

Herts police confirmed that the car was locked and was parked with other vehicles in the car park at the time.

An appeal to find the car on Facebook has so far been seen by more than 7,000 people and has been shared in France, Germany, Cyprus and South Africa.

The Comet: The green classic TR4a was stolen from the showThe green classic TR4a was stolen from the show (Image: Archant)

Stephen Smith, who organised the event. said: “The owner had parked into the public car park, he’d come to see the show and at the end of the day when he went back to the car it wasn’t there. We’re very sad to hear of the loss, it is a very sought after car for criminals.

“I am please to here that the appeal to find the car has gone international and I hope that the car is returned to its owner.”

The two-day car show featured about 500 classic cars including customs, hot rods, Mini Coopers and VWs.

There were also some sport and kit cars, military vehicles and classic motorcycles on display.

Anyone information about the theft of the car or its whereabouts should call police on non-emergency number 101.