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Within the standard approach of effective field theory of weak interactionsfor $\Delta B = 1$ transitions, we look for possibly unexpected subtle NewPhysics effects, here dubbed "flavourful Easter eggs". We perform a Bayesianglobal fit using the publicly available HEPfit package, taking into accountstate-of-the-art experimental information concerning these processes, includingthe suggestive measurements from LHCb of $R_{K}$ and $R_{K^{*}}$, the latteravailable only very recently. We parametrize New Physics contributions to $b\to s$ transitions in terms of shifts of Wilson coefficients of theelectromagnetic dipole and semi-leptonic operators, assuming CP-conservingeffects, but allowing in general for violation of lepton flavour universality.We show how optimistic/conservative hadronic estimates can impactquantitatively the size of New Physics extracted from the fit. With aconservative approach to hadronic uncertainties we find nonzero New Physicscontributions to Wilson coefficients at the level of $\sim 3\sigma$, dependingon the model chosen. Furthermore, given the interplay between hadroniccontributions and New Physics effects in the leptonic vector current, ascenario with nonstandard leptonic axial currents is comparable to the morewidely advocated one with New Physics in the leptonic vector current.

On Flavourful Easter eggs for New Physics hunger and Lepton Flavour Universality violation