A primer analysis of $\pi^0$-$\eta$-$\eta^{\prime}$ mixing from $V\!\rightarrow\!P\gamma$ and $P\!\rightarrow\!V\gamma$
($V=\rho$, $K^*$, $\omega$, $\phi$ and $P=\pi$, $K$, $\eta$, $\eta^{\prime}$) decays
is performed using an enhanced phenomenological model that includes isospin-symmetry breaking.
When the model is contrasted with the most recent experimental data for these radiative transitions,
estimations for the mixing angles amongst the three pseudoscalar states with vanishing third-component of isospin are obtained.
The current experimental uncertainties allow for isospin-symmetry violations with a confidence level of approximately $2.5\sigma$.