1 INTRODUCTION  
2 DATA  
2.1 DES, VHS, VIKING and AllWISE  
2.2 Known ultracool dwarfs  
2.3 Known contaminants  
3 TEMPLATES AND COLOUR SELECTION  
4 PHOTO-TYPE CLASSIFICATION  
5 TOWARDS THE FINAL SAMPLE: TARGET VALIDATION  
6 UCD CANDIDATES CATALOGUE APPLICATIONS  
7 SPECTROSCOPIC CONFIRMATION OF TWELVE ULTRACOOL DWARFS  
8 CONCLUSIONS