thank you. 

I don't quite know when or how it happened, but somewhere along the way I have picked up a strong aversion to the use of flash.  I have a friend who is a master of bulb placement and produces truly stunning night shots, and at some point I should probably try to learn some of that, but at least so far it's all been about making use of whatever light there is, even at the cost of the occasional image whose potential is never realised.