1 INTRODUCTION  
1.1 Radio emission from AGN  
1.2 Paper outline  

2 DATA  
2.1 Near-infrared: VIDEO  
2.2 Optical: CFHTLS and VVDS  
2.3 Radio: VLA  
2.4 Mid-infrared: SWIRE  

3 QUASAR SELECTION  
3.1 K-band selection  
3.2 Photometric fitting  
3.3 Mid-infrared colour  

4 SPECTROSCOPY  
4.1 VVDS data  
4.2 SALT spectra  

5 THE QUASAR SAMPLE  
5.1 Photometric redshifts  
5.2 Absolute i-band magnitudes  

6 RADIO EMISSION FROM RADIO-QUIET QUASARS  
6.1 Radio flux-density measurement  
6.2 Statistical detections of radio emission  
6.3 Quasar-related radio source counts  
6.4 Radio emission from AGN or star formation  

7 CONCLUSIONS