He made his maiden speech on 11 April 1910 supporting one of the resolutions that led up to the Parliament Act 1911. He was re-elected in December 1910, when he only faced a Conservative opponent. Leach supported women's suffrage, but registered his opposition to the actions of the suffragettes. He also supported the Government in passing the National Insurance Act 1911. In February 1911 he introduced his private members Trade Union Bill to try to overcome the problems caused by the Osborne judgment, but it was to disappear into the parliamentary timetable. Despite this he was a very active backbencher asking numerous questions of ministers.