I've had quite a few people commenting that although the new curvy box is very funky, isn't it a total no no environmentally?

In fact if you look on the bottom of the box, you will see that it is made from Polyethylene Terephthalate (not easy to say after a few pints), a type 1 recyclable plastic and carries the symbol below.  As you can read on recycleplastic.org.uk this is a common type of plastic used in plastic bottles and is widely accepted in most household recycling schemes.