Ah right. I spoke to two different people and neither of them managed to tell me that
I'll give them a ring in the morning and see what they say. Although after checking up it makes no difference if DHL screw me around again. You can return anything bought from Waterstones.com to a Waterstones store. So If I get stiffed I can just go and buy one locally and then return the DHL one when it eventually arrives.
I'm such a glass half full person aren't I?