Did you get any power adpator delivered? If you got an EU (schuko) power adaptor, just buy a travel adaptor in the meantime so that you at least can play while Google corrects thei misstake.
What type of adapters did you get? Does the outside of the box say GB at the end of the second barcode?
Do they look like this?
If so you can push up the middle pin...
It's actually not that obvious if you've not seen one before I guess, and Google didn't put much thought into documentation.. they didn't mention where or how you'd get a code in the product, they didn't bother telling you where to get the app or even what it's called (I know that's fairly obvious) but still there's plenty of paper in the box they could have included some basic instructions!