Yeah I did think afterwards that I should've put the AC on etc, but I will check this another time now.
My gut feeling is that this should be ok now. I know the car wasn't used much by the previous two owners as it was a 2nd car like it is for me too and I would say that a combination of age of the battery, cold weather and lack of use on my part has probably contributed to this.
But time will tell!
Thanks again for your help and advice
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1999 Audi S8
1995 Audi URS6 Avant 2.2t
1993 Audi Cabrio 2.3 5cyl
1992 Audi 100 Quattro 2.8v6
2003 Skoda Octavia Elegance TDi