Royal Mail shares rose by more than 4 per cent to 553p this morning after the publication of their results.
The value of shares has risen significantly since being valued at 330p in last month's initial public offer adding to concerns that the company was under-valued.
The group revealed operating profits nearly doubled to £283 million for the six months to September 29.
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National Crime Agency officers have arrested a British man in connection with bribery offences linked to international cricket spot-fixing.
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