Whilst looking for the battery (which is in the back on the S2) I discovered under the washer bottle a reservoir for a suppresion system. It is about the size of an average Xmas turkey. This explains the large,red, shrouded button above the cigar lighter! Contacted the engineer and he confirmed that it has a full fire suppression system fitted, but it was disarmed at the request of the German Type approval people.
Eventually found the battery. I first thought it was some kind of electronic controller. It lies on its side and is only the size of a box of ‘Dairy Milk’. Must be a bit specially to turn over a high compression V6.