P521ORACLE 521 Mon23 Dec C4 9714:54   GEC DETAILS £1.2bn  PLESSEY OFFER GEC, Britain's biggest electrical group, has fired off the first fgrmal shot in its £1.2bn takeover battle fgr the Plessey group. In a package of documents going out to Plessey shareholders, GEC says it is uniquely placed to bring about an "essential change" in UK electrgnics. The UK, it argues, must safeguard and expand its share of the growing wgrld- wide markets for high tech electrgnic1. The combination of the two companies would add "substantially to the UK's capability to compete", GEC says.  * ORACLE XMAS GREETINGS * 495