All changes to tower
| Date | Change | Source |
|---|---|---|
| 1 Jun 2019 | 4,5,6: turning amended; Sct: note added | John Baldwin via database |
| 16 Feb 2012 | 6: historically important | David Knight via e-mail |
| 1 Jul 2009 | 1-6: canons added; Sct: wt,canons added; frame info added | Andrew Higson via 00007667 |