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Recent results from the Daya Bay and RENO reactor experiments have measuredthe smallest lepton mixing angle and found it to have a value of theta_13approximately 9 degrees. This result presents a new challenge for the existingparadigms of discrete flavour symmetries which attempt to describe all quarkand lepton masses and mixing angles. Here we propose a Supersymmetric GrandUnified Theory of Flavour based on Delta(96) x SU(5), together with a U(1) x Z3symmetry, including a full discussion of Delta(96) in a convenient basis. TheGrand Delta(96) x SU(5) Flavour Model relates the quark mixing angles andmasses in the form of the Gatto-Sartori-Tonin relation and realises theGeorgi-Jarlskog mass relations between the charged leptons and down-typequarks. We predict a Bi-trimaximal (not Tri-bimaximal) form of neutrino mixingmatrix, which, after including charged lepton corrections with zero phase,leads to the following GUT scale predictions for the atmospheric, solar, andreactor mixing angles: theta_23=36.9 degrees, theta_12=32.7 degrees andtheta_13=9.6 degrees, in good agreement with recent global fits, and a zeroDirac CP phase delta~0.

A Grand Delta(96) x SU(5) Flavour Model