The group saw shares plunge by as much as 22% as it reported a 4.5% drop in revenues to £142.4 million for the 53 weeks to October 3.

The London-listed group trimmed its group-wide annual revenue guidance to 3.5%-4.5% like-for-like growth within the core business.

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Prime minister Andy Burnham called on Royal Mail last week to address its operational shortcomings

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