P230 ORACLE 230 Wed25 Jul ITV 2305:24   PRINCIPAL CHANG%S ON LONDON Z ST !K MARKET AT 1600 BARCLAYS 246p down 20p (Interim tomorrow) NAT[EST 338p down 17p (Disappointing $dwjdend encrease and profits warning) JOHN BROWN 437p down 16p (Marker tjend) CHANNFL TUNNEL 115p down 15p (Profit— ta3d7g aftfr comment) SIEBE GORMAN 158p down 12p (Profits rftback xfsterd!x4 STAVELEY 254p down 10p (Hrofijs warning xfsterday) LADBROK% 173p down 5p (Fading bid hope3)