well mate, I'm in the same boat, if you get your number from your email and go to "tnt" and click on track international shipping, enter your 9 digit code.
You should get the full current details.
My guess is it will say shipped, from Shenzhen, guandong, which is china, and were there all coming from.
And I have a lot of stuff come from the same part of there, and can take around 4 to 6 days usually.
But given this is TNT a very reputable delivery service, I would be extremely surprised if we haven't got our Ipads by Thursday.
That's what I'm planning my show around, so fingers crossed.
EDIT
here is the link for you to TNT international tracking for all you excited UK customers.....
http://www.tnt.com/webtracker/tracker.do?navigation=1&respLang=en&respCountry=gb