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Flavour physics is a precision laboratory for tests of the Standard Model. Although most of the theoretical work is devoted to the understanding of hadronic effects, QED corrections will become increasingly important when higher experimental precision is reached. Traditionally, QED effects in exclusive B decays are computed under the assumption that mesons are pointlike up to small distances of order 1/mB. This is not justified as photons with wavelength smaller than the typical meson size 1/LambdaQCD can resolve its partonic substructure. A proper treatment therefore requires factorization methods, which in QED are fairly new and still under development. I discuss the recent progress in this direction, with a particular focus on non-leptonic two-body B decays.Abstract: Flavour physics is a precision laboratory for tests of the Standard Model. Although most of the theoretical work is devoted to the understanding of hadronic effects, QED corrections will become increasingly important when higher experimental precision is reached. Traditionally, QED effects in exclusive B decays are computed under the assumption that mesons are pointlike up to small distances of order 1/mB. This is not justified as photons with wavelength smaller than the typical meson size 1/LambdaQCD can resolve its partonic substructure. A proper treatment therefore requires factorization methods, which in QED are fairly new and still under development. I discuss the recent progress in this direction, with a particular focus on non-leptonic two-body B decays.