[Polly]

Ah I think I understand now. As someone fortunate enough to never be anywhere near Dartford, maybe I can explain.
Think of it this way: In order to save costs your local petrol station has decided to install "pay at the pump" petrol pumps, unfortunately these are expensive, so they increase the price of fuel in order to pay for them, and while they doing the changeover there will only be one operative fuel pump so obviously there will be long delays, but don't worry about it, because after the new pumps are installed the company will make a massive profit and (nearly) everyone will be happy😳