The owner of Royal Mail said it remains on track to return to annual profit after a parcel boost over Christmas as its £3.6 billion takeover by Czech billionaire Daniel Kretinsky nears completion.

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It saw revenues lift 2.4% across Royal Mail in the three months to the end of December, with sales of parcels up 3.2% and a 1.4% rise for letters. The group said addressed letters continued to ...