Brit's can go to 166 countries without acquiring a visa first. Iraqis and Afghanis, not so much.
In today's globalized world, visa restrictions play an important role in controlling the movement of foreign nationals across borders. Almost all countries now require visas from certain non-nationals who wish to enter their territory. Visa requirements are also an expression of the relationships between individual nations, and generally reflect the relations and status of a country within the international community of nations.Full list here: [PDF].
