Is the Microsoft Store (UK version) really selling Office as part of the Windows 8 Pro Pack? And is it really a licence for 2 PCs?

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Also; something else I don't understand...

If I look at the website of big UK retailer Currys/PC World, they will sell me
* Windows 8 (standard) Upgrade for 100
* Windows 8 Pro Upgrade for 50.

And it's been like that for a while now. If you're in the market for a Windows 8 Upgrade, why would you buy the standard edition, when the Pro version (which has more features) is half the price? And it's not just Currys, Amazon is the same...