From 1 July, the word Diageo will be used on all its literature and staff contracts. Thousands of trademarks will be moved to Diageo, formed in 1997 by merging Guinness and GrandMet. This demotes the Guinness name, once one of the best-known in the corporate world, merely to a product brand. UDV (United Distillers & Vintners) will disappear.