  We present a data-driven analysis of a concrete Supersymmetric (SUSY) Grand
Unified Theory (GUT) of flavour, based on $SU(5)\times S_4$, which predicts
charged fermion and neutrino mass and mixing, and where the mass matrices of
both the Standard Model and the Supersymmetric particles are controlled by a
common symmetry at the GUT scale. This framework also predicts non-vanishing
non-minimal flavour violating effects, motivating a sophisticated data-driven
parameter analysis to uncover the signatures and viability of the model. This
computer-intensive Markov-Chain-Monte-Carlo (MCMC) based analysis includes a
large range of flavour as well as dark matter and SUSY observables, predicts
distributions for a range of physical quantities which may be used to test the
model. The predictions include maximally mixed sfermions, $\mu\rightarrow e
\gamma$ close to its experimental limit and successful bino-like dark matter
with nearby winos (making direct detection unlikely), implying good prospects
for discovering winos and gluinos at forthcoming collider runs. The results
also demonstrate that the Georgi-Jarlskog mechanism does not provide a good
description of the splitting of down type quark masses and charged leptons,
while neutrinoless double beta decay is predicted at observable rates.
