All changes to tower
| Date | Change | Source |
|---|---|---|
| 24 Jan 2025 | Fr1: truss added; 1-3: nominal, note, canons, turning added | Tim Jackson, from personal visit. Recorded and analysed by Nick Bowden |
| 4 Aug 2017 | 1-3: frameid added; frame info added | John Greenhough via e-mail |
| 2 Dec 2003 | Additional tower | John Cater via e-mail |