According to Paul Carr website it is a 12 x 89 : http://www.paulcarrracingltd.co.uk/index.php?option=com_content&task=view&id=24&Itemid=41
but according to this website it is a 11 x 79 (equivalent to a 12 x 86): http://www.lkrc.uk.com/cirgear.htm
I personally went with my senior max to Buckmore once with a 12 x 86 gearing but I would have liked a higher sprocket as I was not reving high enough at the end of the straight - (note: it was a cold day in Feb so low grip).
I would advise to bring 86, 87, 88 and 89 sprockets with a 12 in the front but put a rear sprocket protector! Lots of kerbing there. Alternatively you can put a 11 in the front to allow you having a smaller one at the back
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