  We show that the four high-energy Littlest Seesaw parameters in the flavour
basis,namely two real Yukawa couplings plus the two right-handed neutrino
masses, can be determined by an excellent fit to the seven currently
constrained observables of low-energy neutrino data and leptogenesis. Taking
into account renormalisation group corrections, we estimate $\chi^2 \simeq
1.5-2.6$ for the three d.o.f., depending on the high-energy scale and the type
of non supersymmetric Littlest Seesaw model. We extract allowed ranges of
neutrino parameters from our fit data, including the approximate mu-tau
symmetric predictions $\theta_{23}=45^o\pm 1^o$ and $\delta = -90^o \pm 5^o $,
which, together with a normal mass ordering with $m_1=0$, will enable Littlest
Seesaw models to be tested in future neutrino experiments.
