Rod
For a very experienced PPL non IMCR/IR rated it is doable if that pilot is very selective on the nights flown.
With any flight IR rated or otherwise the risk levels increase at night partially because any emergency or failure becomes much more serious, but also because it is far harder to navigate at night visually.
Distances become confusing, apart from city shapes there are very few ground features that you can identify and even the cities cannot be positively identified with reference to rivers, railway lines etc as they are at day.
Bring in clouds and weather that can come up on you without you seeing them or poor visibility and that adds up to a recipe for disaster.
Especially in the climb a horizon reference can be lost meaning that the basic PPL is forced to fly with reference to instruments.
IMO to encourage a basic PPL night rated to go anywhere at without a minimum of an IMCR is fraught with danger.
In a single there are other obvious dangers.
If the night rating is for just going up around the local area or flying around the local area on a good night when you can dart back ok but for anything more serious I would question the risk management of that flight.
I also consider it absurd that the CAA put the cart before the horse issuing non instrument trained PPLs with night ratings where they are not trained to deal with potential situations they can so easely and inadvertantly encounter.
Pace