The study of ELM pacing by means of vertical kicks has been extended in JET to heating power levels marginally above the H-mode power threshold, allowing steady-state conditions to be established for particles and energy at lower power than normally observed in the absence of kicks. The experiments shows that inter-ELM dynamics and radiation have to be included in a detailed power balance to account for the variation of the total power required to maintain H-mode conditions and H98~1. Progress in identifying the mechanism responsible for the kick-triggered ELM is shown and the implications of these findings for JET operation with the Be/W wall and ITER are discussed