NOW BRITISHNow That's What I Call Music may have overtaken the world, but it began in Britain, so having an American compilation introducing the best of British pop feels a bit like going through the looking glass. Nevertheless, the London Olympics of the summer of 2012 provide a good excuse for Now That's What I Call British, a hodge podge of post Brit pop singles, some that made it big in the U. S., and many that did not. Now That's What I Call British is