It is in the UK, where it's IFR at night (or SVFR in a CTR). Unlike a lot of the rest of the world which have "night VFR" or similar.
As quoted above though, "in sight of the surface" allows for the use of surface illumination, rather than actual surface features to maintain aircraft attitude without reference to instruments.
So at night in the UK you can be VMC, but must fly in accordance with IFR (OCAS).