Well, received the Battery Management ECU from A8 parts (thanks guys) and unfortunately this didn't solve my issue. So, I ordered a spangly new alternator and hey presto! She works 
Not the part I wished for it to be as it was 5 x more expensive than the used ECU but at least I have my baby girl back 
I've thought that my starter motor has been on it's way out for some time now, but having a new alternator on it spins up a dream!
So weirdly, this was due to the alternator guys, don't rule them out even if the computer scanners are reading V at the alt???
Bex
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07 Silver D3 A/S8L Quattro  S8 front end, Xenons, Bose, Bluetooth, Voice Control, Autodim mirrors, Heated folding mirrors, Double Glazed Windows, Electric Rear & Side Blinds, Black leather Comfort Seats with front memory seats & mirrors, Front & rear heated seats, Interior/Exterior light pack, TV.I.M, AMI, Parking sensors Front & Rear, Air suspension (soon to be lowered), Keyless entry & Start/Stop, 4 zone climate control, Power Boot Open/Close. 
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