FORMER Darlington Harrier Mike Trees, 41, will represent Great Britain in the ITU World Duathlon Championships in Switzerland on Saturday.

This is a gruelling event in which competitors must run ten km, cycle 40km and run 5km in mountainous conditions.

Mr Trees' selection follows his fourth placing in June 2003 in the Duathlon World Cupin the US.

He will be part of a team of five in Zurich