Yep, Old (non-JAA) PPL/Night - I use it flying in Jersey in the 'dark' months fo Island hopping (nice to go for a day to Guernsey/Alderney/France) and be able to come back at a reasonable time.
Agree about the issue of SE flight at night though with the poss of the fan stopping - I didn't go on the idea of "just point at a black bit and hope for the best"! Slightly less worrying at night over water
but the rule there is to find the nearest ferry to ensure you get a good supply of drink when you get picked up
Not really interested in getting my IMC as I don't intend to fly when marginal, and I would worry about currency - flying at night is after all a VFR flight and you shouldn't be fixated on your instruments in the cruise - unless of course you loose any kind of ground/horizon references.