A Sainsbury's music buyer said:
"We felt that some customers might consider this particular album cover to be inappropriate if it were prominently displayed on the shelf."
I smell a massive cover-up (yes, pun intended).
The real reason they are going to display it in a plain cover is because the Manics have been utter crap since 'Everything Must Go' in 1996 and they don't want to have to deal with a flood of irate customer returns.
Hope that clears it up.