Jezbollah
Member
UK authorities received 5 separate warnings by close associates and a warning from the FBI and that wasn't enough to warrant an investigation and he was allowed to travel freely.
That's either incompetence or the structure of the government is so inefficient that it is needlessly putting UK citizens into potential danger every day.
Or it could be that they either mis-prioritised him as a threat or don't have the resources to track all those that are seen as a threat 24/7.