Jack's was a British discount supermarket chain based in Welwyn Garden City, Hertfordshire, owned by Tesco.

[1][2][3] Jack's was founded in 2018 by Tesco as a discount chain to rival stores such as Lidl and Aldi.

Middlewich and Rawtenstall stores previously traded as Tesco superstores before being converted to Jack's.

Chatteris and Immingham were built as Tesco superstores that never opened, instead they were subdivided with Jack's taking approximately half the space, the rest being let to other retailers.

Barnsley was a new build, built specifically as a Jack's store and located in the car park of the town's Tesco superstore.