I do not like criticizing the UK Serious Fraud Office. Its staff are exceptionally committed, and it has a very tough mandate. But my experience of building a global consultancy over 20 years is that hard messages sometimes need to be given, and a failure to deliver the message is demonstrative of personal as well as organizational failure and risks greater harm.
https://fcpablog.com/2020/06/03/five-ways-the-sfo-needs-to-reform-from-an-ex-sfo-prosecutor/