P522ORACLE 522 Mon20 Jan C4 1704:50   GEC OPENS LEGAL ACTION  AGAINST PLESSEY Following telecommunications group Plessey's decision to go to law against GEC in the US, GEC is now to sue Plessey for libel under English law. GEC is also joining Sir John Clarke and two other Plessey directors in the action which follows comments made in a defence circular. Plessey is battling to fend off an unwelcome £2bn bid from the electrgnics giant which started last year after a gentlemanly approach on a possible link A US court last week found for GEC in an action on Plessey's US shareholders. * HOLIDAYS GALORE!! * 580