The Glover Webb/GKN Defence/Alvis Aquatrack was an amphibious load carrier that sadly never entered service with UK forces but found limited export success with the Philippine Marines.
With a 5-8 tonne/40 passenger load its 4.3m x 2.6m load bed could also accommodate a small vehicle
Read more at the link
http://www.army-guide.com/eng/product2854.html