All changes to tower
| Date | Change | Source |
|---|---|---|
| 15 Dec 2022 | Frame Fr1 added | CB ER Yorks, GAD; confirmed by John Arthur. via Frame backlog |
| 10 Feb 2022 | 1-2: nominals updated. Overhaul 1934. | John Taylor records via C J Pickford |
| 22 Dec 2021 | 1-2: nominals added. Key amended. | John Arthur visit Sept 2018 |