www.theherald.co.uk/features/features/display.var.2411567.0.The_hidden_cost_of_choice.php
Basically, if the proposals go ahead, placing requests can be made across boundaries which previously wasn't possible. It's a good article but no one ever seems so concerned if there are 'hidden costs' in the educational choices of the parents of NT children - or maybe they are, I haven't looked into that world yet.