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LONDON, Aug 21 (Reuters) - Britain's FTSE 100 index is seen opening down 144 points, or 2.2 percent lower on Friday, according to financial bookmakers. For more on the factors affecting European stocks, please click on
* The blue-chip index dropped 0.6 percent to 6,367.89 points on Thursday, its lowest close since January.
* BARCLAYS - Barclays shareholders who accused the British bank in a lawsuit of inflating its stock price by manipulating the interest rate known as Libor may pursue their case as a class action, a U.S. judge ruled on Thursday.
* ROYAL DUTCH SHELL - Royal Dutch Shell unit Sarawak Shell Bhd has transferred its 50 percent stake as operator of the MLNG Dua liquefied natural gas (LNG) plant to Malaysian state oil firm Petroliam Nasional Bhd (Petronas) , Petronas said on Friday.
* PETROCELTIC - Irish oil producer Petroceltic International Plc said on Thursday the Irish High Court had ordered the deletion of a blog after finding that its content had defamed the company.
* Annual pay rises in Britain remained stuck at 2 percent in the three months to July and show little sign of picking up soon, a survey showed on Friday.
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> Other business headlines Multimedia versions of Reuters Top News are now available for: * 3000 Xtra : visit topnews.session.rservices.com * BridgeStation: view story .134 For more information on Top News visit topnews.reuters.com (Reporting by Alistair Smout)