Hey mate, you are the master of Windows Phone games so can you help me with that WWTBAM trick?

I changed region to UK but didn't see the game in the marketplace. I noticed something about postal code settings but where do I change that?
I have another email with US postal code and it works on Xbox 360 marketplace so do I need to create different email accounts for each region and then connect them to my phone one by one and download the game?
I'd really need these games for the Completion Competition

Thanks!
By the way you're doing awesome job with those guides!