Lens model of the grade A system EUCL J081705.61+702348.8, created using the Euclid strong lens modelling pipeline implemented with PyAutoLens (Nightingale et al. 2018, 2021). The panels show (i) the observed VIS optical image; (ii) the lens-subtracted image; (iii) the lens model reconstruction of the lensed source; and (iv) the source galaxy reconstructed unlensed emission in the source plane. The system is accurately modelled, providing strong evidence of its lensing nature. The mass model is a singular isothermal ellipsoid with external shear, the lens light is modelled using a multi-Gaussian expansion (He et al. 2024), and the source is reconstructed on an adaptive Delaunay mesh. The inferred Einstein radius is 1$.{}^{″}$18 ± 0$.{}^{″}$03.