Woodcoc2000. At the school I used to teach at if a student wanted to fly after dark the CFI would authorise for that particular instructor to start his/her day at say 11am instead of 9am. This way the FI involved would not have to extend there working day. However lots of instructors out there are hour building and will usually be only to happy to grab the odd hour here and there, especially night hours which are harder to get.
I do agree however that family life must come first! Good luck with your search igarratt!
Tug