The retailer announced plans to introduce brands into its food stores in November last year following a successful 16-month trial in the north east and south east of England.
The rollout of 400 lines to each M&S store is understood to have been completed in England. A spokesman confirmed there were "a few more weeks to go".
Stocking brands had driven an increase in the average number of items bought during each visit, M&S has said.
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