"Why don't we pull down a chimney?" isn't something you'd usually hear in a brainstorming meeting for a new VW spot. But when that particular VW is a new Amarok pick-up, slightly gung-ho thinking can be forgiven. Deciding that the best way to showcase the immense power of the Amarok truck would be to show four of them pulling a 140 tonne chimney stack (that's the same height as Westminster Abbey) to the ground,