In most cases, you will use the Dartford Crossing on your way to the UK. When going clockwise, you will use the bridge; the tunnel serves the opposite direction under the river Themse
The charge for using the crossing is 3 pounds; you can cross for free from 10 p.m. to 6 a.m. The charge is payable by midnight on the following day. Non-payers pay a penalty of up to 120 Pounds. You can pay the charge online on the following website: dartford-crossing-charge
Self pay system is not possible to set for vehicle registered outside UK
Step-by-step instructions for paying the charge for crossing