The Foreign and Commonwealth Office (FCO) advise against all travel to:

[guardsman 256]

10 hours ago, Paul said:

If I followed travel advisories issued by the US government, I wouldn't have traveled to many places. I'm sure other governments are just as full of fecal matter with their CYA notices.

They are, of course, and the independent traveller rightly does what he wants.

Where it becomes significant is with respect to travel insurance.  Travelling to places with a F&CO advisory may invalidate your policy.  This is important to some.