British racing driver Sean Edwards, who was killed in a crash in Australia, was the son of former Formula One driver Guy, who helped pull Niki Lauda from his burning Ferrari at the 1976 German Grand Prix at the Nurburgring.
Sean also appeared in the recently-released film Rush, playing his father.
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An Opposition MP says the PM should address claims relating to the allocation of public funds when he was London mayor.
Harry will also pay tribute to a British soldier killed by an elephant during anti-poaching operations in Malawi.
The family are making an official visit to South Africa.