Unable to activate napoleon total war through my steam account

I have recently received my pre-ordered game.When trying to activate product with steam I get a message saying :

Not available

Sorry but the following items (steam) is not available for purchase in your country (united kingdom). Your purchase has been cancelled.

Has this problem come up before ? Advice would be appreciated.

You can't activate in Europe until Midnight or there abouts.

You can activate now though, as mine came through the post today and it worked.