I was just in my local Whsmiths and saw this offer:
"Save £29.99 when you buy an XBOX 360 and Medal of Honour for £199"
I asked a member of staff if they had any 360's in stock and was told they don't even stock them!
When I pointed out this offer she went and had a look out the back but said they didn't have any.
In the offer there was no mention of whether it was Premium, Pro, Arcade or Core, but the picture showed an XBOX with a wireless controller and a hard drive so I presume its a Premium.
They also had another offer that specifically mentioned it was a Core (360 Core + Prey for £179)
I can't find any mention of this offer on their site so I presume it's in-store only.