Potato specialist Greenvale AP has diversified into sweet potatoes, which it is sourcing from grower group Ontario International of the US.

Beauregard and Covington, orange-fleshed varieties, have started going into Tesco both loose and pre-packed. The company has invested £120,000 in equipment to handle and pack the veg.

"This contract is an opportunity to diversify our operation without compromising our commitment to British growers," said technical manager Paul Coleman.