  We produce five flavour models for the lepton sector. All five models fit
perfectly well---at the one-sigma level---the existing data on the neutrino
mass-squared differences and on the lepton mixing angles. The models are based
on the type-I seesaw mechanism, on a Z_2 symmetry for each lepton flavour, and
either on a (spontaneously broken) symmetry under the interchange of two lepton
flavours or on a (spontaneously broken) CP symmetry incorporating that
interchange---or on both symmetries simultaneously. Each model makes definite
predictions both for the scale of the neutrino masses and for the phase delta
in lepton mixing; the fifth model also predicts a correlation between the
lepton mixing angles theta_12 and theta_23.
