You’re right, Mandelson’s appointment was a failure at all levels of government and should never have been allowed to happen given his past history of sleaze. However, for one thing, we’re not quite privy to all the evidence of what went on yet so we will see.
Your correct Farage doesn’t have access to the security services, but if you think a leader of a political party with all of his influence couldn’t have launched a more in-depth investigation into his own party after one of one of his own party members got done for a very serious crime, then I don’t know what to say, really. Why couldn’t he have asked the police? He could have.
Since Farage, Mandelson and Trump clearly have the same agenda, perhaps they were in cahoots together to get him appointed, along with McSweeney, knowing that one 1) it would give America access to government information, and 2) he would be useful to throw under the bus when the time was right to make Labour look like the immoral ones, not reform.
McSweeney could well be implicated also, since he purged the Labour Party of its more left wing MP’s.
I mean, there was enough information about Mandelson out there in the public domain, yet Farage still endorsed his appointment in late 2024.
https://www.express.co.uk/news/politics/1972726/nigel-farage-donald-trump-US-ambassador-peter-mandelson/amp