  Attempts to incorporate in a coherent picture the $B$-decay anomalies
presumably observed in $b\rightarrow c$ and $b\rightarrow s$ semi-leptonic
decays have to face the absence of signals in other related experiments, both
at low and at high energies. By extending and making more precise the content
of Ref. [1], we describe one such attempt based on the Pati-Salam SU(4) group,
that unifies colour and the $B$-$L$ charge, in the context of a new strongly
interacting sector, equally responsible for producing a pseudo-Goldstone Higgs
boson.
