All changes to tower
| Date | Change | Source |
|---|---|---|
| 1 Jul 2020 | 6: date amended | Dickon Love via 00013875 |
| 11 Mar 2017 | 1-8: canon info added | David Sloman via 00012033 |
| 31 Mar 2014 | 1-8: frame id added; frame info added | John Baldwin via database |
| 31 Oct 2009 | 1-8: nominal added | Nick Bowden via 00008233 |
| 5 Jan 2004 | URL amended | Dickon Love via e-mail |