[HR][/HR] Currently there isn't a date for a UK release, however, if it isn't published in the UK for PAL users there's the Australian/NZ release which is also PAL. $19.99 to GBP translates £13, but as we know the prices aren't direct converts, so it should range between £15 to £20 or even £25, I'd say. Although, if the US release is region-free, you can save yourself £5-10+ in case you import it. Do remember that the retail disc edition offers to be played unlimited on any Xbox 360 console, whereas the digital format version was locked to one Xbox 360 account. So you get more out of the retail collection than format.
I think this would sell pretty well in shops, im sure many people dont even know the game is on XBLA or dont use XBL. People go crazy for Minecraft so im sure it would be a top seller!