Tesco boss Dave Lewis will be quizzed on the performance of the supermarket's new discount store format Jack's next week as the group unveils its half-year results.

Jack's launched just a few weeks ago, with its first stores in Cambridgeshire and Lincolnshire, with the aim to take on German discounters Aldi and Lidl.

Tesco plans to open up to 15 Jack's branches over the next year, but have remained tight-lipped on whether any will come to Norfolk or Suffolk.

Mr Lewis said when Jack's launched that prices will be 'the cheapest in town' at each location.

He added that the move, which has been under discussion at the supermarket for more than two years, is in response to consumer desire for a 'smaller, simpler range at shops'.