How do you remove the rear bumper on a 2008 Vauxhall / Opel Combo Van?

Im looking to install parking sensors, but i can't fathom how you remove the bumper... any help gratefully received!|||when you open the doors their is a row of female torque screws which run along the top of the bumper think thier about a 25 or 30. then there is another 2 torque at the bottom rear of the wheel arches you will also need to remove the trims at the top of the wheel arches which are held on the inside whith 10 mm nits hpe this helps|||I wouldn't bother removing it: Once you've drilled it to fit the sensors, just poke them through %26amp; pick up the wires in front of the bumper. You can then run the wiring either under or through the van from there.|||By having one of your neighbours back into it because they are a blind git - that's how the bumper came off my car.