  The radiative corrections to the $\tau^-\to (P_1P_2)^-\nu_\tau$
($P_{1,2}=\pi, K$) decays are calculated for the first time including the
structure-dependent real photon corrections, which are obtained using Resonance
Chiral Theory. Our results, whose uncertainty is dominated by the
model-dependence of the resummation of the radiative corrections and the
missing virtual structure-dependent contributions, allow for precise tests of
CKM unitarity, lepton flavour universality and non-standard interactions.
