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A charity auction in Monte Carlo added £8,000 to the fund for the Teenage Cancer Trust.
The auction was part of the Full Monte, which saw 30 supercars - including Ferraris, Rolls Royce and Aston Martins - head to Monaco from Broome Park.
Organiser Alex Hamilton, a pupil at Kent College, Canterbury, said: “Everything has gone brilliantly and £8,000 from the auction in the hotel on Saturday night was a real bonus.
“We have a balance of about £32,000 now for the charity and we are already planning next year’s Full Monte."
Participants included Tim Deakin, of former outfitters Deakin’s, and Jerry Copestake, landlord of the Griffin’s Head pub at Chillenden.
Most travelled back to the UK on Wednesday.
For more on the event visit www.fullmonte.org