UK consumers are to be encouraged to recycle their clothes under a new programme launched by retailer Marks & Spencer and charity Oxfam.

The project, described by Marks & Spencer as the biggest of its kind in the country, was launched on the first anniversary of the retailer's Plan A environmental and social strategy.

Under the M&S and Oxfam Clothes Exchange, customers who donate M&S clothes to Oxfam will receive a voucher worth GBP5 (US$9.84), valid for one month and redeemable against their next purchase of GBP35 or more on clothing, homeware or beauty products.

However, the scheme will not cover donations of intimate apparel, swimwear, hosiery and socks. Marks & Spencer said this was because of concerns over the handling of such items and the fact that Oxfam does not sell them.

Only one voucher will be given per donation, and only one voucher can be used per purchase at Marks & Spencer. Vouchers will not be accepted for food purchases.

Starting on 28 January, the programme will initially operate for a six-month trial period, with ongoing reviews.

A Marks & Spencer spokesperson told just-style that Oxfam's status as the UK's biggest charity shop was a major factor in the launch of the programme.

"We wouldn't ever want to try to do a job for which we weren't equipped," she said. "Oxfam has a great track record for tackling poverty around the world, as well as being able to recycle and resell clothes, and also having a solution for items they can't sell."

These items will be sold off in bulk to recycling traders.

Marks & Spencer chief executive Sir Stuart Rose said the scheme would aid Oxfam's work in tackling poverty and injustice, particularly in the developing world.

"It's a triple win - it's good for customers, good for people in developing countries and good for the environment," he added.

Oxfam director Barbara Stocking said: "Recycling and reusing clothes - and anything else we can sell - has always been central to Oxfarm's fundraising, as well as being good for the environment.

"Through our unique textile sorting facility and the resourcefulness and skills of our specialist staff, Oxfam is able to make the most from all the clothes we receive.

"People's unwanted clothes really will raise much-needed money to help people living in poverty."