We can see, however, that although someone is occupying a premium spot, that it is an Adwords bidder, because his ad appears on Google's search partners.
I can only see 4 other reasons why the inventory may not be available:
1)Google Amalgamates premium search terms for plurals and keyword order (I wasn't aware of this)
2)The sales staff are in error.
3)There aren't enough searches to justify inventory (no way - this is a main keyword combination).
4) They make so much money on Adwords clicks they don't want to sell the premium listings at the same price as the other keywords we are taking.
I haven't argued the point with the salespeople yet because they are very sensitive and get their nose put out of joint every time I question something more than once.
Anyone else have similar experiences?