 Andrew Stretton, 18, set fire to a cardboard box in a shed, but the blaze spread to the main building causing serious damage.Stretton was sentenced at Stirling and ordered to carry out 300 hours of community service, and put on probation for two years.The Plean Estate was once owned by the Earl of Dunmore; he had sold it to the Robert Haldane who was already the owner of the Airthrey Estate in Stirling.