Tyrrells is the latest posh crisp maker to launch a range of ridged potato chips, following the ­roll-out of Kettle Ridge Chips in July.

The Furrows range from Tyrrells is available in Waitrose and Booths stores now in sea salted, sea salt & vinegar and mature cheddar & pickled onion flavours (rsp: 70p per 40g, £1.70 per 150g pack).

"Unlike other handcooked chips, Tyrrells Furrows are an ­altogether more authentic crisp," said a spokeswoman. "They have more character delivered by leaving the peel on the potato to give a rustic look, and creating plenty of curl during hand cooking."

Kettle also keeps the ­potato peel on its Ridge Chips, and its 150g packs are 11p cheaper than Furrows'.

Sales of Tyrrells have rocketed 37.7% to £15.7m in the past year [Nielsen].