Do we, the British, have any vital strategic interests in Afghanistan?
If not, call the last 20 years "water under the bridge", with tragic loss of life, many woundings, PTSD, and the colossal waste of money coming to an end.
Let China and Russia and India and Pakistan do what they will, and keep our [very limited] noses out of it.
Probably simplistic, perhaps I need educating. Or perhaps the politicians need educating.