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The Standard Model of particle physics is often regarded as the most
successful theory of nature in the history of science. It has been able
to predict new particles and phenomena which have been systematically
observed, but it is well known that it is not a complete theory. In the
past 15 years, a set of measurements from different experiments have
started to undermine one of its most basic assumptions: that weak
interactions are universal. In this seminar, a review of lepton flavour
universality tests is presented, focussing on the results from the LHCb
experiment at CERN; particular attention will be given to the recently
published R(K) update.