You beat me to the post tamz!
Nope, no code is needed, there is just no postage charge at checkout, I've just ordered some myself, may put in another order (or 2!) before the 4 days are up.
This is a copy of the email text for those that missed it (minus images and links)...
FREE Postage for the next 4 days!
Exante Diet are offering free postage on all orders placed between 12:00 on Thursday 8th October 2009 - until 12:00 on Monday 12th October 2009!
Summer's over, don't let the winter pounds pile on, shake yourself slim with our delicious soups, shakes and bars!
We are the only UK weight loss company who have complete meal replacement soups and shakes that are naturally better for you, with NO Aspartame, Trans fats, Preservatives or Artificial Colours, and all of our products are Gluten Free and are suitable for vegetarians.
Free Postage for the next 4 Days!
To help you on your way Exante will be offering FREE POSTAGE on ALL orders placed before 12:00 on Monday 12th October 2009!