All changes to tower
| Date | Change | Source |
|---|---|---|
| 19 Jun 2020 | 1-6: frameid added; frame Fr1 added | Tim Jackson via e-mail |
| 10 Jun 2014 | 1: Wt,diam,canons added;, founder amended | Philip Denton via e-mail |
| 1 Aug 2010 | 1: nominal added | Nick Bowden via 00008732 |
| 2 Apr 2009 | Date and founder of treble added | Chris Pickford via 00007226 |