  Models of leptonic flavour with discrete symmetries can provide an attractive
explanation of the pattern of elements found in the leptonic mixing matrix. The
next generation of neutrino oscillation experiments will allow the mixing
parameters to be tested to a new level of precision, crucially measuring the CP
violating phase {\delta} for the first time. In this contribution, we present
results of a systematic survey of the predictions of a class of models based on
residual discrete symmetries and the prospects for excluding such models at
medium- and long-term oscillation experiments. We place particular emphasis on
the complementary role that a future circa 50 km reactor experiment, e.g. JUNO,
can play in constraining these models.
