The 12 point lead reflects what other polls are also saying.
If such a lead was replicated on election day Labour would be returned with a majority of 92 seats. Indeed something for, young Ed to get excited about.
But it wins him votes in middle England so why worry about the sensibilities of Wales or Scotland. After all the voters there will vote for him blindly come hell or high water.
He sees the Welsh voter as nothing more than cannon fodder to Labour’s Westminster ambitions. Treat them like mushrooms. In the dark with copious amounts of muck thrown at them.