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We re-analyse the effect of corrections from canonical normalisation ofkinetic terms on the quark and lepton mixing angles. This type of correctionsemerges, for example, from effective higher-dimensional Kahler potentialoperators in the context of locally supersymmetric models of flavour. Incontrast to previous studies we find that the necessary procedure of redefiningthe fields in order to restore canonically normalised kinetic terms, i.e.canonical normalisation, can lead to significant corrections to the fermionmixing angles (as determined from the superpotential). Such potentially largeeffects are characteristic of flavour models based on non-Abelian familysymmetries, where some of the possible Kahler potential (and superpotential)operators, in particular those associated with the third family, are onlymildly suppressed. We investigate under which conditions the messenger sectorof such flavour models generates such Kahler potential operators for which thecanonical normalisation effects are sizeable, and under which conditions theseoperators may be absent and canonical normalisation effects are small. Asexplicit examples for potentially relevant CN effects, we will discuss thecorrections to the CKM matrix element |V_{cb}| as well as corrections totri-bimaximal neutrino mixing.

Third Family Corrections to Quark and Lepton Mixing in SUSY Models with non-Abelian Family Symmetry