The principle of Lepton Flavour Universality in the Standard Model is challenged by persistent tensions in semileptonic B-decays. The ratios $R(D)$ and $R(D^{*})$, in particular, show a combined discrepancy with predictions of over three standard deviations. This proceeding presents three recent LHCb results that investigate this anomaly. We report a new precision measurement of $R(D^{+})$ and $R(D^{*+})$ using muonic $\tau$ decays, which confirms the tension. This is followed by the first search for semitauonic decays to excited $D^{**}$ states, which finds that this key background is insufficient to explain the anomaly. Finally, a measurement of the $\Lambda \to p \mu^{-} \bar{\nu}_{\mu}$ decay provides a complementary test of LFU in the baryon sector, finding results consistent with the Standard Model and sharpening the focus of the flavour puzzle.