Steve, with a larger than average van, head for Juntion 48 on the A16. Turn North on the D247 and at the next roundabout turn left and then left again into Pidou Wine Warehouse.
It is ideal for large HGV because you can drive around the building in a big circle.
You can also pick up simple shopping like bread cheese butter etc
Park as close as you can to the entrance. Check underneath before you leave. You never know.