All changes to tower
| Date | Change | Source |
|---|---|---|
| 4 Aug 2009 | Tenor note not A; nominal: Ab+36c intl (=Ab-18c old concert) | Andrew Higson via pNBR |
| 2-6: nominal added; 5: turning info added | Andrew Higson via 00007964 | |
| 8 Apr 2005 | PN no longer Wed | Wendy Campbell (GDR Sec) via e-mail |