P205 ORACLE 205 Fri31 Dec ITN 0030:01   THATCHER'S PLEDGE  TO PARTY WORKERS Mrs Thatcher says she will not be changing her policies in the run-up to the next general electionN "We shall not slacken or shirk now," she says in a New Year message to Tory party workers. But she said the cure for unemployment could only be "slow and arduous". There could be bno quick fix".  Labour leader Michael Foot hits out at the "Thatcherite cut-throat society" in his New Year message to the Party. He claims there is hope for Britain if all sections of the Labour movement co-operate with one anotherN