Ian.
With the gun lamp/torch, if you can just see a rats come out with the solar lights, but there's not enough light to see to shoot, start with the gun lamp on as lower brightness as you need to shoot with, and start with the lamp above the rat, then slowly bring it down onto the kill zone. If youve to scan with the lamp to find the rat in the first place, move the lamp slowly, when you see the rat at the edge of the beam, again move the beam above the rat and come slowly down on to it, and get the shot off as quick as possible, a red filter is good in two ways one is it doesnt spook the rats as much and two the rats eyes glow back at you red, giving you a perfect aiming point, just be careful moving the lamp about on the rat, because they see this as movement, and it can spook them. You sound to be doing very well so far, as there numbers get lower and the remaining rats wise up they will get harder to get, but its possible that you might just about get them before they have chance to wise up, keep up the good work.

Dave (warbucks)