Update on my Dartford Crossing annoyance. Found the scene on YouTube and saw that the cars were going the other way at the toll booths. I know that the tunnels used to be one direction on the left, and the other direction on the right, and if the bridge has to close during bad weather, the tunnels will do that again. So that's all OK. Now here's the problem. In that scene, you can see the Dartford Crossing behind one of the death eaters before the motorbike lands, and you can see traffic on it! It must of closed very quickly...