Recently did some night flying training (in a G-reg R44) and went over all the applicable night flight related rules with an instructor (don't know what he was reading from) However, I'm only speaking in regards to flying privately; not commercial.
On a side note, for those holding both EASA and FAA licenses, the "in-built" night flying privilege of the FAA license doesn’t work in UK as the UK FAA exemption includes the wording “DAY VFR only” – that I have directly from the CAA
Does that hold for Fâa pilots flying n reg helicopters.