Government documents running to 147 pages have revealed new details about the appointment of Lord Mandelson as the UK's ambassador to the US and the fallout from his sacking last year. It's the first release of files related to the process to hire and later fire Lord Mandelson, after MPs forced the government to disclose the files. Lord Mandelson was sacked as ambassador last year after revelations emerged about his friendship with the late convicted sex offender Jeffery Epstein. The peer is under criminal investigation over allegations of misconduct in public office and has repeatedly let it be known that he believes he has not acted criminally, did not act for personal gain and is co-operating with the police. Here are the key details from the first batch of documents. The documents show that Prime Minister Sir Keir Starmer was advised that Lord Mandelson's relationship with Epstein posed a "general reputational risk" ahead of his confirmation as US ambassador.…