Just off the phone with TNT, lovely lady explained A LOT:
She told me first that my package isn't yet in their system, disappointing but sure. She told me that there has been a delay at their end due to Computer2000, which are the ones handling the passing of the item to TNT. When they sent through their electronic data on the packages, the FIRST ADDRESS line of EVERY package was replaced with 'Gordon House', which she described as 'causing a nightmare for TNT logistics'.
She further informed me that my package is likely in ones given a 'short stay' by Computer2000, so that the data will be properly transmitted with proper address information, and is therefore unlikely to come today, but if picked up today will come tomorrow for sure as the shipping is all 24 hour for Google orders. There's clearly been some communication between TNT and Google on this, as she told me "Although I can't give you more information on your package, you can call Google and they might be able to tell you more."
Very interesting conversation. SO, at least in part, some blame for the shipping is with Computer2000.