Historical clue formulations

• River islands — 2015-06-07
• River islands — 2011-11-13
• Small islands — 2010-07-18
• Brentford and Isleworth in the Thames, e.g. — 2006-10-28
• River isles — 2006-04-23
• Isles — 2005-06-26
• Small islands — 2001-08-08
• Islets — 2001-06-02
• River isles — 2001-03-01
• Isles — 1998-04-19
• British isles — 1997-05-04
• Islets — 1995-11-10
• River isle — 1994-05-08
• Small islands — 1994-03-27