  In this work we discuss our consistent implementation of the minimal model of
Universal Extra Dimensions in CalcHEP. We pay special attention to the gauge
invariance issues that arise due to the incorporation of 5D quantum
corrections. After validating the implementation we perform a complete study of
the tri-lepton signature, including a realistic estimate of the backgrounds,
for the present LHC energy and luminosity. We also derive the expected LHC
discovery reach for different luminosities, at centre-of-mass energies of both
7 TeV and 8 TeV.
