sentences:  Thatcher responded by moving Howe to Leader of the House of Commons (despite giving him the title Deputy Prime Minister he was now effectively removed from decision-making over Europe) and by listening more to her adviser Sir Alan Walters on economic matters.Lawson resigned that October, feeling that Thatcher had undermined him.Thatcher continued to be the leading international advocate of a policy of contact with apartheid South Africa, and the most forthright opponent of economic sanctions against the country, which was ruled by a white minority government.