Did a quick search but couldn't see anything.
Free bar of chocolate at Milka:http://www.milka.co.uk/milka2/page?PagecRef=625
Follow the on screen "journey" at milka and it will then take you to a printable coupon that you can exchange at a Sainbury's for a free bar of Milka chocolate, no purchase necessary.
Deadline has been extended
My first post, hope this is ok :)