  Motivated by recent experimental measurements on flavour physics, in tension
with Standard Model predictions, we perform an updated analysis of New Physics
violating Lepton Flavour Universality, by using the effective Lagrangian
approach and in the Z' and S_3 leptoquark models. We explicitly analyze the
impact of considering complex Wilson coefficients in the analysis of
B-anomalies, by performing a global fit of R_K and R_K*0 observables, together
with \Delta Ms and A_CP^mix. The inclusion of complex couplings provides a
slightly improved global fit, and a marginally improved \Delta Ms prediction.
