All changes to tower
| Date | Change | Source |
|---|---|---|
| 16 Dec 2024 | 4: nominal, note added | Recorded by John Greenhough and analysed by Nick Bowden |
| 20 Nov 2012 | URL added | Tower website via www |
| 31 May 2010 | 1-4: frame id added; frame info added | John Baldwin via database |
| 28 Mar 2007 | GF added | Tim Jackson#109 via e-mail |