"Archived copy"(PDF). www.nasuwt.org.uk. Archived from the original(PDF) on 19 July 2011. Retrieved 15 January 2022.{{cite web}}: CS1 maint: archived copy as title (link)
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"Archived copy"(PDF). www.nasuwt.org.uk. Archived from the original(PDF) on 19 July 2011. Retrieved 15 January 2022.{{cite web}}: CS1 maint: archived copy as title (link)