LONDON (Dow Jones)--Spirent Communications PLC (SPT.LN) said Tuesday it Tuesday purchased through RBS Hoare Govett 230,000 of its ordinary shares at an average price of 108.12 pence per share. MAIN FACTS: -These shares will be cancelled. -Shares closed Tuesday at 108.2 pence. -By Tommy Stubbington, Dow Jones Newswires; 44-20-7842-9268; [email protected] (END) Dow Jones Newswires June 29, 2010 12:35 ET (16:35 GMT)