All changes to tower
| Date | Change | Source |
|---|---|---|
| 9 Oct 2009 | 1-6: nominal, canons, turning, frame id added; 4-6: diam added; | Roy Williams via 00008181 |
| Frame info added | Roy Williams via 00008181 | |
| 10 Jun 2006 | No longer u/r | Jane Mason, Secretary HDG via e-mail |
| 20 Jun 2004 | Serious GR correction (from 422656) | Fugawi OS map via JCB |