Leaders of the Opposition

More than this, however, there are various practical reasons why the system has been seen as desirable by successive Leaders of the Opposition since 1955.

Front-bench opposition: the role of the Leader of the Opposition, the Shadow Cabinet and Shadow Government in British politics, Robert Malcolm Punnett, Heinemann, 1973http://books.google.co.uk/books?id=_aBCAAAAIAAJ&q=%22leaders+of+the+opposition