1 INTRODUCTION

2 OBSERVATIONS  
2.1 The KMOS Lens-Amplified Spectroscopic Survey  
2.2 Target selection  
2.3 KLASS observing strategy and reduction  
2.4 Reduction  

3 EMISSION LINE SEARCH, PURITY AND COMPLETENESS  

4 REIONIZATION INFERENCE  
4.1 Bayesian inference framework  
4.2 Defining a selection function for a photometric sample  
4.3 Inference on the IGM neutral fraction  

5 DISCUSSION  
5.1 The timeline of reionization  
5.2 M1149 JD1 – Ly α emission at $z=9.11$?  
5.3 Other UV emission lines at $z\sim8$  
5.4 Background limited observations with KMOS  

6 SUMMARY AND CONCLUSIONS