We propose to undertake a large area public IR survey programme using the planned UKIRT Wide Field Camera (WFCAM). There are several components to the programme.
The scientific impact of such a programme ranges from the very nearest and faintest objects in the solar neighbourhood, through the structure of the Milky Way, to the most luminous and distant quasars at z=7. We aim to measure the sub-stellar mass function, to detect the era of re-ionisation, to measure cosmological parameters from the abundance of clusters at z>1, and to detect the era of spheroid formation if there was one. As well as achieving these intended goals, the public database resulting from the survey will be a fundamental international resource, and a goldmine of scientific projects for years to come.