P251 ORACLE 251 Fri 4 Feb ITN 2100:00     WORLD   SERIES England have been concentrating on fielding practice before tomorrow's vital game against New ZealandN Victory in Perth would put England into the finals,probably against New Zealand The only selection problem is whether to continue playing two spinners or to bring in Norman Cowans or Derek Pringle But it is unlikely the team will show any changes from that which beat Australia at the weekend. In their last meeting England allowed New Zealand to score 297 runs to win with Hemmings, Lamb and Marks dropping fairly easy catches.