I don't think the location is correct for a van, that would about the place it would be in an estate. This looks like a van with a rear seat conversion where the load bed has been chopped out.
In a van the battery should be directly behind the drivers seat at the front of the load bed, there is a large void behind the battery under the loadbed and if I remember correctly there is a metal plate vertically from the front of the load bed to the floor that the battery is sat against.
You can sort of see what it should be like here:
http://www.therealmi...van-restoration