Some have argued that it is difficult for Gordon Brown to extricate the British military from Afghanistan, but it is easy; here is a statement Gordon Brown could make:
The involvement of Britain in the invasion and occupation of Afghanistan was a mistake. While many British military personnel have perished, nothing has been achieved: Afghanistan has not become a Western-style democracy, nor has our involvement contributed in any way to enhancing Britain’s security. For that reason I announce that the British military will be withdrawn as soon and as quickly as possible.
It’s as simple as that.