No worries mate, I have posted on his thread a few times...
So, the plot thickens - I checked all the old receipts I got from Duffy when I purchased the car, and there is a receipt for a Bosch S4 110 Battery in his name, dated 27/04/2015, however this is what is in the boot:
So my guess is he put the old battery back in when he sold it? I really can't think of any other explanation to it, seems odd, but I think based on what I see and what's happening a new battery is required.
That link you posted, is that the same one you bought? I only ask because I used the eBay parts checker and it said it doesnt fit my car?