Tesco has reached an agreement to merge with food wholesaler Booker in a £3.7 billion deal.
The supermarket giant said the agreement will create "the UK's leading food business" and deliver significant efficiency savings for the combined group.
ITV News Consumer Editor Chris Choi said it raises questions over market dominance:
Some will ask why Britain's biggest grocery retailer has been allowed to buy Britain's biggest food wholesaler - too much market dominance?
Tesco now has UKs largest uk food business
Tesco chief executive Dave Lewis said: "Tesco has made significant progress in turning around our UK retail business.
"This merger with Booker will further enhance Tesco's growth prospects by creating the UK's leading food business with combined expertise in retail, wholesale, supply chain and digital."
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A Tesco Bank customer whose account has been frozen has been left "completely stuck", unable to withdraw money from his account, following a hacking attack on the bank.
Dave Turner said he had attempted to contact the bank to find out why he cannot use his account, but they "seemed confused".
Tesco Bank has said customers will not be able to complete transactions online throughout Monday in an emergency security measure, yet Mr Turner is unable to use his card at cash machines and does not dare to use it in chip and pin devices and be left unable to pay for something.
More than 24 hours after contacting the bank, the father from Portsmouth said he had still not heard back which was "unacceptable" and "pretty poor really", and had only received a generic text message at 4am on Monday morning.
Mr Turner has said he will look into opening an account with another bank after being left relying on money lent to him from family and friends, adding "it's happened this time, so yeh, it could happen again".
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