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Flux ratio anomalies in quasar lenses can be attributed to dark mattersubstructure surrounding the lensing galaxy and, thus, used to constrain thesubstructure mass fraction. Previous applications of this approach infer asubstructure abundance that potentially in tension with the predictions of a$\Lambda$CDM cosmology. However, the assumption that all flux ratio anomaliesare due to substructure is a strong one, and alternative explanations have notbeen fully investigated. Here, we use new high-resolution near-IR Keck~IIadaptive optics imaging for the lens system CLASS B0712+472 to performpixel-based lens modelling for this system and, in combination with new VLBAradio observations, show that the inclusion of the disc in the lens model canexplain the flux ratio anomalies without the need for dark mattersubstructures. The projected disc mass comprises 16% of the total lensing masswithin the Einstein radius and the total disc mass is $1.79 \times 10^{10}M_{sun}$. The case of B0712+472 adds to the evidence that not all flux ratioanomalies are due to dark subhaloes, and highlights the importance of takingthe effects of baryonic structures more fully into account in order to obtainan accurate measure of the substructure mass fraction.

SHARP - IV. An apparent flux ratio anomaly resolved by the edge-on disc in B0712+472