Thanks for the advice guys - unexpectedly out of the country so apologies for reply delay. There are two main scenes - one is a guy in a field in the middle of nowhere and the other is a crowded street in a city. I'll probably end up using a bit of all suggestions, shooting some stuff at day, some at night and using some day for night where I can get away with it. Has anybody come across anything in post that's made day for night more 'real' - my concern lies, as usual, with the sky in dfn shots. Can always nd it, etc, but I never quite buy it.