M&S is offering money off its range of children's clothing to parents who donate old school uniforms.
The school uniforms collected by the supermarket will then be sold in an Oxfam store or through eBay's new “back-to-school” online shop later this summer.
The scheme is an extension of M&S’s existing “shwopping” partnership with Oxfam, in which customers drop off old clothing in exchange for loyalty card perks.