Historical clue formulations

• One of 50,460 in the Chunnel — 2022-05-15
• About 39 inches, in England — 2016-04-18
• About 39 inches, in England — 2012-09-17
• Cambridge measure — 2010-06-11
• It's around a yard around Buckingham Palace — 2009-10-10
• Reading rhythm — 2008-03-28
• Downing Street distance — 2007-01-23
• About a yard, at Scotland Yard — 2006-10-18
• English distance — 2005-09-25
• Reading unit? — 2005-02-27
• 39+ inches, in Britain — 2004-11-10
• Length unit in Lyon — 2003-12-17
• What some British poetry has — 2003-05-03
• Canadian length — 2003-04-25
• About 39 inches, in England — 2002-07-01
• Downing Street distance — 2000-12-26
• Scotland yard, approximately — 1999-08-01
• London length — 1997-02-11
• Downing Street distance — 1996-02-02
• Scotland yard? — 1995-08-06
• Downing Street distance — 1994-02-13