1 INTRODUCTION  
2 COUNTERPART IDENTIFICATION  
2.1 Radio and mid-IR matching catalogues  
2.2 Choice of search radius  
2.3 Radio and mid-IR identifications  
2.4 False identification rate  
2.5 Comparison with SCUBA identifications  
3 REDSHIFT DISTRIBUTION  
4 SPECTRAL ENERGY DISTRIBUTIONS  
5 CONCLUSIONS