All changes to tower
| Date | Change | Source |
|---|---|---|
| 7 Sep 2023 | 1-4,6: diameter added; 3-6: canons amended; 1-6: turning added | Stephen Jakeman #005537 |
| 18 May 2020 | 1-6: frameid added; fr1: details added | Tim Jackson via e-mail |
| 15 May 2016 | 'Unringable' not strictly accurate, though far from easy | Nick Carver (and after discussion with Incumbent) via e-mail |