Apparently,on their fans forum they have closed blocks 7to 11 to save money and so that their fans are closer for a better atmosphere.As these blocks are home end only they can't obviously give us them thus reducing the capacity significantly.
Not sure if I've linked that properly but google MK Dons stadium plan gives you some idea of where you are . Booked mine plus 6 train tickets booked aswell
If that's the one that gets into Carlisle just after 10am i'm on that aswell with 5 others and fans we've spoken to over the last few days there are quite a few others