We will motivate the impact that new B physics data are already having on model building. Using a left-right model with spontaneous CP violation as an example, we will show how the inclusion of the new B physics observables and, specially, their combination with K physics observables has significantly widened our capacity to constrain and even exclude models. We will also discuss, on the contrary, how theory in a quite model independent way together with certain hypotheses may help us 'to test' data on B -> pi K decay modes once experimental errors are reduced.