Tesco has launched its new discount store format called Jack’s as it attempts to take on the German discounters Aldi and Lidl.

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Tesco said that eight out of 10 Jack’s food and drink products will be "grown, reared or made" in Britain and stores will stock an own brand range, also branded Jack’s.

Britain’s biggest retailer will open its first two Jack’s stores on Thursday in Chatteris, Cambridgeshire, and Immingham, North East Lincolnshire.

Up to 15 stores will open over the next year, with five existing Tesco properties being repurposed and the remainder being new outlets.

Most products will be Jack’s own brand and the chain will have 2,600 lines.

The Chatteris store is the first to open under the new brand.

Chief executive Dave Lewis, speaking in Cambridgeshire, said: "(Tesco founder) Jack Cohen championed value for customers and changed the face of British shopping.

"It’s fitting that today, we mark the beginning of Tesco’s celebration of 100 Years of Great Value by launching a new brand, and stores bearing his name: Jack’s."

It comes after the UK’s so called Big Four supermarkets - Tesco, Asda, Sainsbury’s and Morrisons - have taken a hammering at the hands of Lidl and Aldi.

The German duo have eaten up their market share by offering products at knock down prices.

Tesco is Britain’s grocery market leader with a share of 27.4%, while Aldi and Lidl have increased their combined share to 13.1%, according to the Kantar Worldpanel data.

Tesco said that eight out of 10 Jack’s food and drink products will be "grown, reared or made" in Britain and stores will stock an own brand range, also branded Jack’s.