GB Day Visits 2011 (2012). The 2011 report is also available here, prior to 2011 the reports was done every 5 or 6 years, 2005 being the previous version:
GB Day Visits 2011 (2012). The 2011 report is also available here, prior to 2011 the reports was done every 5 or 6 years, 2005 being the previous version: