sentences:  Chamberlain even became acting Leader of the Opposition in the absence of Balfour.With approximately 102 of the remaining Unionist MPs supportive of Chamberlain, it seemed that he might become leader of the Unionists, or at least win a major concession in favour of tariff reform.Chamberlain asked for a Party meeting, and Balfour, now returned to the Commons, agreed on 14 February 1906 in the 'Valentine letters' to concede that
  
  Fiscal Reform is, and must remain, the constructive work of the Unionist Party.