1 INTRODUCTION  
2 OBSERVATIONS AND DATA REDUCTION  
2.1 JCMT HCN 4-3 and HCO$^+$ 4-3 data  
2.2 Ancillary data  
2.3 Data reduction  
3 RESULTS  
4 DISCUSSION  
4.1 Dense-gas star-formation relationship  
4.2 The relationships between star-formation efficiency, dense-gas fraction and stellar components  
5 SUMMARY