London, July 20 - Henry Surtees, teenage son of 1964 Formula One world champion John, died Sunday in an accident in the Formula Two race at the Brands Hatch circuit.

The 18-year-old driver was struck on the head, during the second of the weekend's two races, by a tyre from the car of rival Jack Clarke, who had spun into the wall exiting Westfield.

The Daily Telegraph reported that Henry was knocked unconscious by the impact and failed to negotiate the following Sheene Curve, his car running off the track and into the barrier. When medics reached him, his rear right tyre was still spinning furiously, his foot apparently still on the accelerator.

He was rushed to the circuit's medical centre, where his condition was stabilised.