‘Downing Street’s decision to publish the second batch of letters that Prince Charles had sent to ministers was unexpected. The government had been preparing to resist the publication of the latest batch, covering the years 2006 to 2009, even though a previous batch, covering 2004 and 2005, was released after a ten-year legal battle with the Guardian.’
The Guardian, 4th June 2015
Source: www.guardian.co.uk