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Thanks James. You have provided the right amount of info, so many dodn't provide enough.
It does appear to sound like a duff battery. 12.8v sounds a bit low for a battery being charge by the car. You should expect more like 13.0 - 13.2 for a good battery.
Do you know how old the battery is in your car?
If its the original one then I would change it. Winter takes a heavy toll on batteries, so 12.8 is probably enough in the summer but not winter.
Where did you get the battery tested?
Other than that it may be the alternator/regulator.
Currently in SportTourer's garage:
2010 Laguna III SportTourer Initiale Tom Tom.