RE2Fe3Si5 are unusual superconducting systems, with coexistence of magnetism on the RE site with superconductivity ( the Fe does not support a magnetic moment). Of particular interest is the Tm variant of this material which is not superconducting at ambient pressure but has an antiferromagnetic ground state below 1.1K. For pressures of greater than 2 Kbar this compound does develop superconductivity, but this state is destroyed by the formation of the antiferromagnetic order. It is extremely unusual for the development of antiferromagnetic correlations to destroy the superconducting state. These effects are believed to be due to interactions between the magnetism and the two band superconductivity of this compound. We wish to establish the nature of the superconductivity by examining the temperature dependence of the penetration depth in the non-magnetic version Lu2Fe3Si5.