It seems the control unit has gone West.
The plan is to buy a used unit and "introduce" it to the existing CAN nodes on the bike, it seems this part is fairly widespread.
 13617711832 Control unit BMS-KP INTERN
From:     06/26/2007 To:     03/28/2008 (ENDED)
Price:     $931.60
Superseded by:
13617717143     (03/03/2008 — 09/01/2008), Exchangeable retrospectively
13617719873     (09/01/2008 — 04/23/2009), Bilaterally exchangeable
13617722565     (01/01/2009 — 11/16/2010), Exchangeable retrospectively
Supersedes: 
13617709053     (01/12/2007 — 10/10/2007), Exchangeable retrospectively
13617704861     (08/01/2006 — 01/12/2007), Exchangeable retrospectively
13617702076     (02/08/2006 — 07/26/2006), Exchangeable retrospectively
13617699069     (08/01/2005 — 02/23/2006), Exchangeable retrospectively
13617697304     (03/01/2005 — 07/25/2005), Exchangeable retrospectively
13617692220     (07/01/2004 — 03/21/2005), Exchangeable retrospectively
13617687762     (01/02/2004 — 07/08/2004)
My GS-911 is  GS40068801-18A9 Bluetooth capable: Yes
WiFi capable: No
Before I launch into the murk, does anyone know if my plan is achievable using a GS-911.
Many thanks in advance
Jim