L4D2 UK release date won't be brought forward

Wasn't possible because copies of the game are still on their way to stores.

Valve has announced that due to "high demand" for Left 4 Dead 2 it has decided to "move various street dates forward for a coordinated worldwide release". That's except for the UK where this wasn't possible because copies of the game are still arriving.

Valve added that it plans to "have everyone in the UK playing Left 4 Dead 2 by Friday morning," which is the original release date for the title.