Recent data from LHCb and the B factories exhibit intriguing deviations from the Standard Model in B decay observables related to lepton flavour universality violation. I will review the current status of these anomalies and outline the possible diections in BSM model building to address them. I will then introduce a specific BSM model, which is based on the Pati-Salam gauge group in the 5-dimensional Randall-Sundrum spacetime.