UK retailer Marks and Spencer and charity Oxfam have raised GBP1m in six months through their Oxfam Clothes Exchange partnership, which will now become permanent after a successful trial.

Extra revenue is being used to pay for Oxfam's programmes in Rwanda, the Democratic Republic of Congo and Kenya.

The money has been generated by the sale of extra M&S clothes donated to Oxfam shops through the Exchange, which offers a GBP5 M&S voucher in return. The voucher is then redeemable against a GBP35 spend on clothing, home or beauty products at M&S.

The partnership - which was initially scheduled for a six month trial - will now continue indefinitely, the companies announced.

Richard Gillies, director of Plan A, Marks & Spencer said: "The success of the Clothes Exchange shows that it is possible to be responsible and save money at the same time.

"Thousands of people have saved on their M&S shopping by donating M&S clothing they no longer need to Oxfam, which has helped the charity to raise more money to fight poverty.

"It's also helped to reduce the amount of clothing sent to landfill by 1,000 tonnes over the last six months. We hope the campaign will continue to go from strength to strength in future."