Retail guru Mary Portas is on a mission to transform Britain’s high street by reinventing the image of charity shops.

Her challenge is being documented in a three part series on BBC2: Mary, Queen of Charity Shops. Mary is managing her own shop in Orpington with the intention of overhauling charity shops in line with the retail sector.

As part of the M&S and Oxfam Clothes Exchange, customers making a donation of M&S clothes to Oxfam will receive a voucher worth £5/€7, valid for one month, to use with their next purchase of £35/€50 or more on clothing, homeware or beauty products at M&S.

The Exchange will be trialled for six months and reviewed on an ongoing basis, and from 28th January vouchers will be given out in exchange for M&S clothes in Oxfam’s 790 stores across the UK and Republic of Ireland....