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The mechanism of launching and powering relativistic jets in AGN is still not understood comma but must link to the accretion flow. Evidence for this comes from the clear change in blazar jet properties at L-LEddvirgul0.01 comma probably due to the accretion flow transition from a geometrically thick ADAF to a thin disc. There should be another transition at L-LEdd > 1 comma where the accretion disc should puff up comma but this is harder to study as few radio-loud AGN are super-Eddington. RX J0134.2-4258 is a robust super-Eddington NLS1 with L-LEddvirgul11 comma the highest of all radio-loud AGN known. Therefore comma we propose a joint XMM-Newton-NuSTAR program to study the accretion disc comma corona and jet mechanism in this new radio-loud super-Eddington regime.