I bet if you go into your dealer, explain that you reckon you have waited long enough, and are thinking of cancelling the order, its amazing how the wheels start to turn.
We got all this stuff about 12 weeds for a Dynamic and up to 20 for a trekking from Armold Clark. Border Cars on the other hand stated 6 weeks for Dynamic and 10 to 12 for Trekking, BUT, if we were willing to take any colour, then times would be days instead of weeks.
It was the same when we ordered the new car "KIA VENGA", Both Edinburgh dealers were 8 weeks delivery, We placed the order with Border Cars and picked the car up 21 days later. Their policy seems to be if you leave the customers hanging about for too long then they will go and purchase else where, and in this day and age it makes a lot of sence.
cheers Ian