All changes to tower
| Date | Change | Source |
|---|---|---|
| 2 Jul 2018 | 1-3: turning added | John Baldwin via database |
| 23 Jun 2016 | 1-3: frameid added; frame info added | David Sloman via e-mail |
| 28 Apr 2009 | 1,2: historically important | John Baldwin via database |
| 6 Jan 2004 | Slight Grid ref change (from 457025) | Tim Jackson via e-mail |