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An enhanced phenomenological model that includes isospin-symmetry breaking ispresented in this letter. The model is then used in a number of statisticalfits to the most recent experimental data for the radiative transitions$V\!P\gamma$ ($V=\rho$, $K^*$, $\omega$, $\phi$ and $P=\pi$, $K$, $\eta$,$\eta^{\prime}$) and estimations for the mixing angles amongst the threepseudoscalar states with vanishing third-component of isospin are obtained. Thequality of the performed fits is good, e.g.$\chi^2_{\textrm{min}}/\textrm{d.o.f} = 1.9$. The current experimentaluncertainties allow for isospin symmetry violations with a confidence level ofapproximately $2.5\sigma$.

$\pi^0$-$\eta$-$\eta^{\prime}$ mixing from $V\!\rightarrow\!P\gamma$ and $P\!\rightarrow\!V\gamma$ decays