Hi, don't be tempted to use the drive over and pay later on line if you have a private HGV classed (over 3500kg) MH or you will find you will get charged £4, we normally drive through and pay later if in car to beat the queues and it's just £1.50, been over in MH a few times in no rush and the nice operated in the booths just assume we are under 3500 kg and charge us £1.50 - every little helps