Very interesting but not entirely surprising. Clearly the Taliban will arrange things as best they can to demonstrate that they have freedom of movement. Having said that, I suspect that the taliban having freedom of movement is no news to British forces in the area.
We just don't have enough men on the ground to dominate the area. As I see it we bounce around doing raids but they bounce around as they please.
We (and I include the Afghan National Government when I say this) can't claim to be in control when we turn up, have a firefight and then clear off.