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We have used several different methods (radio morphology, radio spectralindex, mid-IR to radio and near-IR to radio flux density ratios) todiscriminate between AGN and SFGs in faint, sub-mJy radio surveys. We find thatthe latter two methods are the most powerful with current multi-wavelengthdata, but that future radio surveys with eMERLIN, LOFAR etc. (and ultimatelythe SKA) will greatly increase the power of the morphology and spectral indexmethods. As an example of the science possible we derive the IR luminositydensity from the radio-selected SFGs using the radio/IR luminosity correlation.We also examine the contribution by luminosity to the total IR luminositydensity and find evidence that fraction of LIRGs remains constant or decreasesabove z=1 while the relative fraction of ULIRGs continues to increase up toz=2.5.

The Contribution of Radio Selected Star Forming Galaxies to the IR Energy Density Budget