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It's also entirely possible the battery was screwed after the first time, hence its failed again so soon, although I did leave attached to the the CTEK overnight
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Yes this is entirely possible. If you run battery flat enough that it does not start the car it will damage it. If you run it flat enough that dash lights don't come on you will damage it a lot, if you leave it at this discharged state for week it will be pretty much unusable.
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I did leave attached to the the CTEK overnightt
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How many amps is your charger? 5 amp CTEK charger will take about 20hrs to charge good fully discharged 100Ah battery to 80% and then another 25-30hrs to get to 100%
There are no commonly known issues that will drain battery in D2, parking on incline should not affect it unless you have blocked plenum chamber drains, it could cause water to overflow in rain and leak onto electronics so parking on incline could be a factor if or where the water will come in. Only thing VCDS can check on D2 is voltage.
You could go to Halfords and ask them to check battery condition for you they normally do it free of charge.
You might also want to check residual drain current from battery with everything off.
Another possibility is poor ground or positive connection for for battery which could lead to less current going through and slowing the battery charging when running and giving less current when cranking. You can check this by comparing voltages measured directly on battery, battery + to ground and + at the front of car to ground.