Still no luck but thought I'd keep updating to pay it forward, if anyone else has similar in the future...
Checked battery coding, all good.
Cleared all fault codes one by one, reset the time/date in the car, turned off the car and returned after a few minutes to try starting again.
Latest scan shows
Saturday,26,March,2022,14:05:22:55062
VCDS Version: Beta 12.10.3
Data version: 20130228
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
Chassis Type: 8T0
Scan: 01 03 05 06 07 08 09 0E 10 15 16 17 19 1E 36 37 42 46 47 52
53 55 56 77
VIN: WAUZZZ8T98A040712 Mileage: 151610km/94206miles
01-Engine -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
04-Steering Angle -- Status: OK 0000
05-Acc/Start Auth. -- Status: OK 0000
06-Seat Mem. Pass -- Status: OK 0000
07-Control Head -- Status: OK 0000
08-Auto HVAC -- Status: Malfunction 0010
09-Cent. Elect. -- Status: Malfunction 0010
0E-Media Player 1 -- Status: OK 0000
10-Park/Steer Assist -- Status: OK 0000
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: OK 0000
1E-Media Player 2 -- Status: OK 0000
36-Seat Mem. Drvr -- Status: OK 0000
37-Navigation -- Status: OK 0000
42-Door Elect, Driver -- Status: OK 0000
46-Central Conv. -- Status: Malfunction 0010
47-Sound System -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
53-Parking Brake -- Status: OK 0000
55-Xenon Range -- Status: OK 0000
56-Radio -- Status: OK 0000
77-Telephone -- Status: OK 0000
-------------------------------------------------------------------------------
Address 01: Engine (J623-CAUA) Labels: 079-907-560-CAU.clb
Part No SW: 8T0 907 560 F HW: 8T0 907 560
Component: 4.2l V8/4V H10 0004
Revision: 76H10---
Coding: 01140003180F0120
Shop #: WSC 00097 210 80549
VCID: 3D7A8E9EA4A6B8F6A43
No fault code found.
Readiness: 0110 1101
-------------------------------------------------------------------------------
Address 03: ABS Brakes (J104) Labels: 8K0-907-379.clb
Part No SW: 8K0 907 379 S HW: 8K0 907 379 S
Component: ESP8 quattro H04 0210
Revision: -------- Serial number: --------------
Coding: 114D00
Shop #: WSC 06325 123 12345
VCID: 4992EA4EE06E145618B
No fault code found.
-------------------------------------------------------------------------------
Address 05: Acc/Start Auth. (J393) Labels: 8K0-907-064-05.clb
Part No SW: 8K0 907 289 C HW: 8K0 907 289 C
Component: BCM2.01 H38 0253
Revision: 00003002
Coding: 031000
Shop #: WSC 06325 000 00000
VCID: 39729A8EB08E84D688B
Subsystem 1 - Part No SW: 8T0 959 754 AB HW: 8T0 959 754 AB
Component: FBSAUDIB8 IDG H61 0072
Subsystem 2 - Part No SW: 8K0 905 852 D HW: 8K0 905 852 D
Component: ELVAUDIB8 H35 0039
No fault code found.
-------------------------------------------------------------------------------
Address 06: Seat Mem. Pass (J521) Labels: 8T0-959-760.clb
Part No SW: 8T0 959 760 B HW: 8T0 959 760 B
Component: MEM-BFS H09 0043
Revision: AA000000 Serial number: 00001001075293
Coding: 00217025002C44110000
Shop #: WSC 06325 000 00000
VCID: 4280FD62DD58C70ED91
No fault code found.
-------------------------------------------------------------------------------
Address 07: Control Head Labels: 8T0-035-7xx-07-H.clb
Part No SW: 8T0 035 729 T HW: 4E0 035 729
Component: Interfacebox H43 5570
Revision: 00000000 Serial number: 329DV087553733
Coding: 0025002
Shop #: WSC 06325 000 00000
VCID: 4A90D54225681F4E111
Subsystem 1 - Part No: 8T0 919 609
Component: E0380 BedienteilH08 0100
Subsystem 2 - Serial number: 00000000062954
Subsystem 3 - Serial number: 0127.03.080000000100010032ÿ
Subsystem 4 - Serial number: 010032ÿ
No fault code found.
-------------------------------------------------------------------------------
Address 08: Auto HVAC (J255) Labels: Redir Fail!
Part No SW: 8T2 820 043 N HW: 8T2 820 043 N
Component: KLIMA 3 ZONEN H05 0120
Revision: D1000000 Serial number: 0117.03.080998
Coding: 48060000
Shop #: WSC 06325 000 00000
VCID: 3D7A8E9EA4A6B8F6A43
1 Fault Found
01206 - Signal for Duration of Ignition Off Time
008 - Implausible Signal
Freeze Frame:
Fault Status: 01101000
Fault Priority: 7
Fault Frequency: 1
Reset counter: 186
Mileage: 151614 km
Time Indication: 0
Date: 2008.02.13
Time: 01:23:05
-------------------------------------------------------------------------------
Address 09: Cent. Elect. (J519) Labels: None
Part No SW: 8K0 907 063 D HW: 8K0 907 063 D
Component: BCM1 1.0 H21 0253
Revision: 05021001 Serial number: 00000000117735
Coding: 2600D0154114AF211709000300005D5D4F9D038800010141000000
Shop #: WSC 06325 123 12345
VCID: 3064A7AA63F4459E3F5
Subsystem 1 - Part No SW: 8T2 955 119 C HW: 8J2 955 119
Component: WWS 170208 H11 0040
Coding: 00FD11
Subsystem 2 - Part No SW: 8K0 955 559 HW: 8K0 955 559
Component: RLS H04 0003
Coding: 02532C
Subsystem 3 - Part No SW: 8K0 941 531 G HW: 8K0 941 531 G
Component: E1 - LDS H07 0070
1 Fault Found
03207 - Charisma Switch Module
004 - No Signal/Communication
Freeze Frame:
Fault Status: 01100100
Fault Priority: 3
Fault Frequency: 1
Reset counter: 186
Mileage: 151614 km
Time Indication: 0
Date: 2008.02.13
Time: 01:23:00
-------------------------------------------------------------------------------
Address 0E: Media Player 1 Labels: 4E0-910-111.lbl
Part No SW: 8T2 035 110 C HW: 8T2 035 110 C
Component: MP3-Changer H42 0390
Revision: 00042001 Serial number: AUZ5ZBH8336377
Shop #: WSC 00000 000 00000
VCID: 2B5EB0C68AD226460A7
No fault code found.
-------------------------------------------------------------------------------
Address 10: Park/Steer Assist
Cannot be reached
-------------------------------------------------------------------------------
Address 15: Airbags (J234) Labels: 8K0-959-655.clb
Part No SW: 8K0 959 655 B HW: 8K0 959 655 B
Component: AirbagVW-AU10 H26 0410
Serial number: 0038JD148VTU
Coding: 30323433363030303030554A305238543053
Shop #: WSC 06325 000 00000
ASAM Dataset: EV_AirbaECUVWAUDI010 A02007
ROD: EV_AirbaECUVWAUDI010_AU48.rod
VCID: 3C7C839AB7BCB1FE93D
Crash sensor for side airbag; driver side:
Serial number: 6334MSME35343025+
Crash sensor for side airbag; passenger side:
Serial number: 6344MSME3853157FL
Crash sensor for side airbag; rear driver side:
Serial number: 6352QSME5C1B455FZ
Crash sensor for side airbag; rear passenger side:
Serial number: 6362QSME5B0D5059Q
Crash sensor for front airbag; driver side:
Serial number: 63732SME57713137X
Crash sensor for front airbag; passenger side:
Serial number: 63832SME584B772FG
No fault code found.
-------------------------------------------------------------------------------
Address 16: Steering wheel (J527) Labels: 8K0-953-568.clb
Part No SW: 8K0 953 568 F HW: 8K0 953 568 F
Component: Lenks.Modul H11 0012
Revision: -------- Serial number: 90315HD10001D
Coding: 000016
Shop #: WSC 06325 000 00000
VCID: 3D7A8E9EA4A6B8F6A43
Component: E221 - MFL H02 0003
No fault code found.
-------------------------------------------------------------------------------
Address 17: Instruments (J285) Labels: 8T0-920-xxx-17.clb
Part No SW: 8T0 920 981 C HW: 8T0 920 981 C
Component: KOMBIINSTR. H28 0221
Revision: 00000000 Serial number: 72028R148
Coding: 2F0D010003002600010000
Shop #: WSC 06325 123 12345
VCID: 3C7C839ABFBCB1FE93D
No fault code found.
-------------------------------------------------------------------------------
Address 19: CAN Gateway (J533) Labels: 8T0-907-468.clb
Part No SW: 8T0 907 468 K HW: 8T0 907 468 K
Component: GW-BEM 4CAN-M H09 0092
Revision: EB302042 Serial number: 4200E0831982A8
Coding: 000303
Shop #: WSC 06325 000 00000
VCID: 4992EA4EE06E145618B
Subsystem 1 - Part No SW: 8K0 915 181 B HW: 8K0 915 181 B
Component: J367-BDM H03 0150
No fault code found.
-------------------------------------------------------------------------------
Address 1E: Media Player 2 (R199) Labels: 4E0-035-785.lbl
Part No SW: 4E0 035 785 F HW: 4E0 035 785
Component: SG ext.Player H15 0850
Revision: 00000000
Coding: 010000
Shop #: WSC 06325 000 00000
VCID: 2B5EB0C64AD226460A7
No fault code found.
-------------------------------------------------------------------------------
Address 36: Seat Mem. Drvr (J136) Labels: 8T0-959-760.clb
Part No SW: 8T0 959 760 B HW: 8T0 959 760 B
Component: MEM-FS H09 0043
Revision: AA000000 Serial number: 00001001078166
Coding: 00397325002C44110000
Shop #: WSC 06325 000 00000
VCID: 4280FD62DD58C70ED91
No fault code found.
-------------------------------------------------------------------------------
Address 37: Navigation Labels: 4E0-910-88x-37.lbl
Part No SW: 4E0 910 888 P HW: 4E0 919 887 M
Component: MNS ECE H51 1060
Revision: 00000000 Serial number: 333D.087553978
Shop #: WSC 00097 210 90088
VCID: 3B7E80867AB2B6C69A7
No fault code found.
-------------------------------------------------------------------------------
Address 42: Door Elect, Driver (J386) Labels: 8K0-959-793.clb
Part No SW: 8T0 959 793 J HW: 8T0 959 793 D
Component: TSG FA H07 1301
Revision: -------- Serial number: --------------
Coding: 011C02225E01120102
Shop #: WSC 00498 210 91091
VCID: 50A4C72A0334259E5F5
No fault code found.
-------------------------------------------------------------------------------
Address 46: Central Conv. (J393) Labels: 8K0-907-064-46.clb
Part No SW: 8K0 907 289 C HW: 8K0 907 289 C
Component: BCM2.01 H38 0253
Revision: 00003002 Serial number: 0110242140
Coding: 011B0682003904C0033000
Shop #: WSC 06325 123 12345
VCID: 39729A8EB08E84D688B
Subsystem 1 - Part No: 8K0 951 177
Component: DWA-Sensor H02 0040
Subsystem 2 - Part No: 1K0 951 605 C
Component: LIN BACKUP HO H03 1301
1 Fault Found
01503 - Bulb for 3rd Brake Light (M25)
012 - Electrical Fault in Circuit - MIL ON
Freeze Frame:
Fault Status: 11101100
Fault Priority: 2
Fault Frequency: 1
Reset counter: 186
Mileage: 151614 km
Time Indication: 0
Date: 2022.03.26
Time: 13:52:57
-------------------------------------------------------------------------------
Address 47: Sound System (J525) Labels: Redir Fail!
Part No SW: 8T0 035 223 T HW: 8T0 035 223 F
Component: DSP Prem H14 0400
Revision: 00H14003 Serial number: 34814004936001
Coding: 020101
Shop #: WSC 12336 024 394758
VCID: 3F86F496AEAAAAE6B6F
No fault code found.
-------------------------------------------------------------------------------
Address 52: Door Elect, Pass. (J387) Labels: 8K0-959-792.clb
Part No SW: 8T0 959 792 J HW: 8T0 959 792 D
Component: TSG BF H07 1301
Revision: -------- Serial number: --------------
Coding: 011C02225E01120102
Shop #: WSC 00498 210 91091
VCID: 4FA6C4561E0A3A6646F
No fault code found.
-------------------------------------------------------------------------------
Address 53: Parking Brake (J540) Labels: 8K0-907-801-V1.clb
Part No SW: 8K0 907 801 D HW: 8K0 907 801 D
Component: EPB Audi B8 H04 0050
Revision: 00000003 Serial number: 10000000013157
Shop #: WSC 00000 000 00000
VCID: 3064A7AA63F4459E3F5
No fault code found.
-------------------------------------------------------------------------------
Address 55: Xenon Range Labels: 8K0-907-357.clb
Part No: 8K0 907 357 B
Component: Dynamische LWR H01 0010
Revision: 00000001 Serial number:
Coding: 0000002
Shop #: WSC 06324 000 00000
VCID: 346CABBA57EC79BE5BD
No fault code found.
-------------------------------------------------------------------------------
Address 56: Radio Labels: 4E0-910-541.lbl
Part No SW: 4E0 910 541 T HW: 4F0 035 541 L
Component: TUNER EU/US/RDW H42 0630
Revision: 00000000 Serial number: 336D 087548648
Coding: 0000001
Shop #: WSC 06325 000 00000
VCID: 3162A2AEA8FE4C9630B
No fault code found.
-------------------------------------------------------------------------------
Address 77: Telephone Labels: 4F1-910-336.lbl
Part No SW: 4F1 910 336 D HW: 4F1 862 335
Component: BTA H11 1120
Revision: 00H11000 Serial number: 00000007568552
Coding: 0010021
Shop #: WSC 06325 000 00000
VCID: 254A46FEEC361036DC3
No fault code found.
End ---------------------------------------------------------------------
Charisma fault code is expected since I have no buttons for it, this was enabled well over a year ago, if not longer.
Third brake light code thrown is expected since it's faulty (and I can't get the damn thing out!)
HVAC code is a concern, no idea what it's all about. Possibly something to do with the retrofit car play fitted a few weeks ago? Ignition switch? Who knows?
Engine readiness showing some not ready (just found out about this since coming back in from the car), presumably this is due to the fact the battery was dead and changed so ECU reset but shouldn't stop the car turning over?
Only thing I haven't checked are fuses/relays and the starter (due to being in a stupid location!).
Was really hoping she would miraculously jump back to life after a little tinkering but alas, I guess I'm destined to not drive her for a while longer.
As mentioned, it is booked in to an indy VAG specialist on Monday. Left them some notes about the charisma, car play and what I've done since I wont be here when they recover it so wont get chance to tell them these things. Will see what comes back and will post what they tell me.