25 September - 18 October 2023 - Condition Survey
27 September & 04 November 2022 - Condition Survey
20, 21 & 28 September 2021 - Condition Survey
21-24 April 2020 - Condition Survey
27 June 2019 - Condition Survey
29 June 2018 - Condition Survey
27 October 2017 - Condition Survey
29-31 July 2015
16-20 September 2014
2 -26 November 2012
9-15 June 2011
24, 28-30 June 2010
12-13 & 20-21 March 2008
8 February & 2, 14 March 2007
17, 19, 23 & 24 May 2006
3,4, 7 - 9 March 2005
20 - 22 April 2004
19 - 21 March 2003
January 2002