Brief: Science Group Increases Stake In Ricardo To 21.8%
May 28 (Reuters) - Science Group PLC SAGS.L: SCIENCE GROUP PLC - RICARDO INVESTMENT AND OPEN LETTER SCIENCE GROUP PLC - INCREASES STAKE IN RICARDO TO 21.8% Source text: ID:nRSb3094Ka Further company coverage: SAGS.L ((Reuters.Briefs@thomsonreuters.com;))