05/10/2017 New section, a BT Heritage Film from 1982, Wire Broadcast Warning Systems for the Future. HANDEL / HANDEL Warning System
25/09/2017 HANDEL / Power Siren Added Switch Panel Type 3 and SECOMAK siren, 8 new photos from Paul Lawrence:
09/09/2017 Related Topics / GPO->BT Added Switch Panel in situ (tnx Richard Bowden) and revised layout of HANDEL / Power Siren page.
03/07/2017 Related Topics / GPO->BT Added 6 photos of the construction of Portsdown PR1.
13/05/2017 HANDEL / before HANDEL Six additional photos of control unit to System-E gallery from the BT Archives.
12/05/2017 From BT Archives: WB200 Carrier Control Point, 2 photos added HANDEL / Warning System. Gallery of Unit Sig. WB600 added to HANDEL / WB400&600
10/05/2017 Revised Overview / Civilian Government adding BT Archive material and using accepted designation CGWHQ consistently across website.
29/04/2017 Added 12 Images to the galleries from BT Archives, updating text in various topics on HANDEL / WB400&600 page.
20/04/2017 Exploring the BT Archives online.
10/03/2017 Revised Communications / Networks Era 1 "Radio Backup to Landline" adding Coventry aerials photo. Added new topic "Posts to Group HQ Radio".
27/02/2017 Revised and moved some WB400 text from HANDEL / Warning System to HANDEL / WB400 adding a HANDEL section with diagram of remote clock control.
23/01/2017 Added tunnel plan and equipment layout of Birmingham Anchor Exchange to gallery Related Topics / GPO->BT
07/12/2016 Added WB200, a 1951 field trial of a warning system, leading to the development of WB400 in HANDEL / HANDEL Warning System
05/12/2016 Added SHR Radio Room & Eddystone, photographs from Jim Went.
05/12/2016 Historical data added HANDEL / HANDEL Warning System and Related Topics / Other WBs from BT Archives of GPO E-i-C Reports, extracted by Dan Glover.
06/11/2016 Added: Two photographs of CONRAD vehicles. MOULD vehicle in civilian colours. Upper Menu Tab: Post Strike
13/09/2016 Major revision to the History of GPO Microwave Network, debunking many Backbone myths. Page: Related Topics / GPO->BT
12/09/2016 Added two Gents siren photos, modified text, tnx Jason Miles. Page: HANDEL / Power Siren. Bug Cleared: unable to select Contact Me tab when using MS Edge browser.
25/04/2016 Added a little more detail for RN2, London South, Brown Clee Hilltop. Page: Communications / Networks ERA2
29/07/2015 New photographs of later switch panel added to siren page. Internal photographs from Alistair McCann of the old Grey TeleTalk AD3460 added.
18/07/2015 Thanks to tremendous feedback from four contributors, the new power siren page now contains 50 detailed photographs.
30/06/2015 Added a dedicated siren page, replacing fragmented coverage on WB600 & WB1400: HANDEL / Power Siren.
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