All changes to tower
| Date | Change | Source |
|---|---|---|
| 15 Dec 2022 | 1-5: nominal added | Front five recorded by Adam McCurdy and analysed by Nick Bowden |
| 6 Sep 2020 | 6: nominal added | Bill Hibbert via 00013979 |
| 15 Nov 2010 | URL removed | JCB via URLbad |
| 8 Sep 2005 | Slight GR change (from 178..) | Tim Jackson#83 via e-mail |