Where a van has blind spots
A van's blind spot isn't one place but several zones at once. Compared with a car, there's no view through the rear window, the sides are larger and you sit higher. Before you set off, it's worth knowing where someone can walk around the vehicle without you seeing them.
The whole area behind the vehicle
You can't see anything at all behind a van. The bulkhead or the load makes the rear-view mirror useless, so the area directly behind the rear is blind for several metres. A camera covers it only partially and unreliably in the rain or after dark. This is where most minor damage in car parks happens.
The right-hand side, especially at the back
The most dangerous zone is the strip along the right-hand side from the passenger door backwards. A cyclist or even a whole car can fit in here. In a van, this area is longer than in a car, and you have no way of checking it by turning your head. The only tool is the right-hand mirror and looking in good time.
The left-hand side when turning
A blind zone forms on the left too; people just think about it less. When turning at a junction, a motorcyclist or cyclist overtaking you can fit into it. A longer vehicle also takes longer to enter a junction, so more time passes between checking and driving through than in a car. Before you start turning the wheel into the oncoming lane, look in the left-hand mirror once more.
Pillars and door mirrors
The front pillar can hide a pedestrian on a crossing. In a taller van you sit differently from in a car, so the pillar covers a different slice of the scene from the one you're used to. At junctions and roundabouts, move your head slightly forwards and backwards; this shifts your view around the pillar.
What you block yourself
A load stacked high takes away even what's left of the view the van offers. A box resting against the side window by the passenger door enlarges the blind spot by a section you don't expect. When you're carrying a tall load, leave the space by both front doors clear and, before reversing, always check that nothing is blocking your view in the mirrors.
Walk around the vehicle once from the driver's seat too. Have someone stand at different places around the stationary van one after another and watch when they disappear from both mirrors. A minute of this test will show you the blind spot of the specific vehicle better than any description.