Brief: Derwent London Launches £50 Million Share Buyback
May 12 (Reuters) - Derwent London PLC DLN.L: DERWENT LONDON PLC - TRADING STATEMENT DERWENT LONDON PLC: NEAR AND MEDIUM-TERM EARNINGS GUIDANCE IS UNCHANGED DERWENT LONDON PLC - LAUNCHES £50M SHARE BUYBACK Source text: ID:nRSL8675Da Further company coverage: DLN.L ((Reuters.Briefs@thomsonreuters.com;))