LAST year Tesco began to reward customers for reusing carrier bags, by giving them a green Clubcard point for every bag reused.

By April 2007 the supermarket giant estimated that it had given out 400 million fewer bags, saving around 13 million a week.

Tesco is now giving the chance for one lucky Bucks Green Press reader to win £30 worth of vouchers.

All you have to do is answer the following question - how many bags does Tesco estimate it saves every week?

Send your answers to Bucks Free Press, Loudwater Mill, Station Road, Loudwater, High Wycombe, Bucks, HP10 9TY.

Closing date for entries is Tuesday, November 13.