  We study an effective theory of flavour in which the $SU(2)_L$ interaction is
`flavour-deconstructed' near the TeV scale. This arises, for example, in UV
models that unify all three generations of left-handed fermions via an
$Sp(6)_L$ symmetry. Flavour-universality of the electroweak force emerges
accidentally (but naturally) from breaking the $\prod_{i=1}^3 SU(2)_{L,i}$
gauge group to its diagonal subgroup, delivering hierarchical fermion masses
and left-handed mixing angles in the process. The heavy gauge bosons transform
as two $SU(2)_L$ triplets that mediate new flavour non-universal forces. The
lighter of these couples universally to the light generations, allowing
consistency with flavour bounds even for a TeV scale mass. Constraints from
flavour, high mass LHC searches, and electroweak precision are then highly
complementary, excluding masses below 9 TeV. The heavier triplet must instead
be hundreds of TeV to be consistent with meson mixing constraints. Because only
the lighter triplet couples to the Higgs, we find radiative Higgs mass
corrections of a few hundred GeV, meaning this model of flavour is arguably
natural. The natural region will, however, be almost completely covered by the
planned electroweak programme at FCC-ee. On shorter timescales, significant
parameter space will be explored by the High-Luminosity LHC measurements at
high-$p_T$, and upcoming lepton flavour violation experiments, principally
Mu3e.
