  We propose a mechanism that allows for sizeable flavour violation in
quark-lepton currents, while suppressing flavour changing neutral currents in
quark-quark and lepton-lepton sectors. The mechanism is applied to the recently
proposed 4321 renormalizable model, which can accommodate the current
experimental anomalies in $B$-meson decays, both in charged and neutral
currents, while remaining consistent with all other indirect flavour and
electroweak precision measurements and direct searches at high-$p_T$. To
support this claim, we present an exhaustive phenomenological survey of this
fully calculable UV complete model and highlight the rich complementarity
between indirect and direct searches.
