Hannah Cowie is only 17, but she has already embarked on her third business venture.

Hannah Cowie

Her first designed and sold painted silk ties to businessmen in London. At 15 she ran a company at her school, St Helen and St Katharine in Abingdon, through Young Enterprise, a body that gives children a taste of business.

This year, when Hannah was offered the chance to join a World Challenge trip to Mexico costing £3,000, she hit on the idea of selling long-sleeved T-shirts with sporty designs. She has raised £1,000 so far. To obtain a copy of her catalogue, e-mail hannahcowie@hotmail.com

Tonight sees the finals of this year's Oxfordshire Young Enterprise Scheme for schools at the Culham Science Centre, near

Abingdon.