Double glazed = 2 paynes of glass with an air gap between them.
Laminated = 2 paynes of glass which are bonded together with no gap.
So are your windcreens double glazed then?
ETA - Look at the 7 series LWB; that has double glazing i.e. with a gap, and not disimilar to the type found on houses.
Range Rover in 2005 went to laminated side glass, and in 2007, this was changed to double glazing.
here is what double glazing looks like on a car - much thicker due to the air gap.