The Competition Commission is investigating claims Tesco and Asda bullied suppliers into cutting their prices to finance their price wars.
The Commission has ordered the supermarkets to hand over all internal emails, taped telephone conversations and other documents sent and received during five weeks in June and July.
The investigation will involve sifting through more than 12 million documents and could delay the initial findings of the watchdog's inquiry, which are due late next month.
Both supermarkets denied the accusations and said they would co-operate fully with the Commission's request.
The Commission has ordered the supermarkets to hand over all internal emails, taped telephone conversations and other documents sent and received during five weeks in June and July.
The investigation will involve sifting through more than 12 million documents and could delay the initial findings of the watchdog's inquiry, which are due late next month.
Both supermarkets denied the accusations and said they would co-operate fully with the Commission's request.
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