It has been created by Thorntons in honour of the company's 100th birthday and, after months of top-secret cooking, the treat was unveiled Wednesday in front of staff and visitors at the confectioner's headquarters in Alfreton, Derbyshire.
http://ummid.com/news/2011/October/13.10.2011/worlds_largest_chocolate.htm
http://ummid.com/news/2011/October/13.10.2011/worlds_largest_chocolate.htm
