As the Post Office scandal continues to make the headlines, Panorama investigates the UK’s other great postal institution, Royal Mail. Millions of us rely on letters for hospital appointments, tax returns and legal documents, but as reporter Zoe Conway discovers, Royal Mail is not always delivering.

Last year, it was fined more than £5 million for missing targets. Panorama hears from whistleblowers and senior management, who believe the postal system must change if Royal Mail is to survive. Is it the last post for the letter? Show less