ockel: As someone who has posed similar questions to Mr Impey in the past I can understand that some people could perceive his responses as short, terse or even flippant. 
I can assure you that he treats every question on its merits but he does expect people to take the time to be fully informed and consider all issues (so if there is an obvious answer to a generic question then thats what you'll get back). 

And as was mentioned by ZollyMonsta a lot of these areas are commercially sensitive - especially in an environment where your largest competitor is subsidised (and owned) by the Government. 

Importantly this is the first interview that I can recall since the Ironbridge transaction and I can assure you that many people have been interested in hearing his views but been unable to get access to him.  And these are clearly answered by Mr Impey rather than being handled by someone else within Mediaworks.  So I think hats off to Mauricio for organising a coup.