Thanks swathdriver - your tiger looks fantastic! Do you have any more photos?
I am leaning towards SPz.Abt.501 which later became part of the 1st Panzer division I think. The colour of the original Tigers seems to be a matter of discussion ranging from grey to olive green to stolen American olive drab to the more commonly depicted sand yellow. I think that they were painted sand yellow when they came under 1Pz and that what aslo whhen they started using the large red numbers on the turret sides.
Here is a model I found on Missing Lynx which I like... http://hyperscale.com/features/2002/tigerigc_1.htm

PS - how do I downlad an image onto the forum?