It comes after it emerged the peer failed security vetting but the Foreign Office still allowed him to take up the post.
No 10 says the government is working to ensure "anyone potentially abusing our immigration system is held accountable".
Glyn Razzell is approved for parole despite never revealing the location of his wife's body.
Covid vaccines saved hundreds of thousands of lives, but a small minority harmed need better support, says report.
Andrew Mountbatten-Windsor received the historic honour in 2012 "by virtue of patrimony".