All changes to tower
| Date | Change | Source |
|---|---|---|
| 10 Dec 2012 | PN info amended (CHECK first is advised) | David Floyd (info: Shona Gilmour-White) via e-mail |
| 26 Jan 2012 | PN info added - but CHECK first is advised | David Floyd (info: Shona Gilmour-White) via e-mail |
| 21 Jan 2012 | 1-5: frame id added; frame info added | John Baldwin via database |