It sounds as though the Irish HSA is getting every bit as persnickety as the British HSE (Health & Safety Executive).
As bulky as BS546 15A connectors are, the 16A CEEform types are huge for such use. For individual lights up to 1kW or so the BS546 system at least offers the much smaller 5A versions, and on all the theatre lighting I've been involved with we used a mixture of 5 and 15A connectors.
