1 INTRODUCTION  
2 THE LOTSS DEEP FIELDS  
2.1 LOFAR observations of the LoTSS Deep Fields  
2.2 LoTSS-Deep DR1  
2.3 Multi-wavelength data in the LoTSS Deep Fields  
3 CHARACTERISING THE LOTSS-DEEP HOST GALAXIES  
3.1 Optical to mid-IR data  
3.2 Far-infrared data  
3.3 Final catalogues for spectral energy distribution fitting  
3.4 Spectral Energy Distribution fitting  
4 IDENTIFICATION OF RADIATIVE-MODE AGN  
5 COMPARISON OF DERIVED PROPERTIES AND CONSENSUS MEASUREMENTS  
5.1 Consensus stellar masses  
5.2 Consensus SFRs  
6 IDENTIFICATION OF RADIO AGN  
7 FINAL RADIO SOURCE CLASSIFICATIONS, AND DEPENDENCIES  
8 COMPARISONS WITH SIMULATED SKY MODELS  
9 SUMMARY