Flavour changing radiative decays for strange and charmed hadrons are studied in a model where the GIM weak interaction triggers the flavour change at the quark level and QCD corrections are taken into account. The amplitudes for photon emission are calculated for both non-factorisable (negligible) and factorisable contributions (dominant). We thereby achieve a “modern pole model” in which we include 56 and 70 intermediate states and normalise the amplitude in terms of the fundamental quark weak interaction. We generate large parity-violating amplitudes and explain qualitatively the relative size of all processes. We find a pattern of allowed ( Λ→n + γ), ( Ξ 0→ Σ 0 γ) and ( Ξ 0→ Λγ), suppressed ( Σ +→p + γ) and doubly suppressed decay (Ω −→Ξ + γ) which show the complex pattern of symmetry and dynamical cancellations and enhancements. Following Shifman et al., we also show that short distance effects are negligible. Other approaches are discussed and in particular it is shown that the asymmetry in Σ +→p + γ poses no theoretical problem. Many predictions can be tested with the forthcoming new generation experiments.