Snares are a huge subject in themselves, but the laws in the UK are very strict and the number of sets which can be employed here can be counted on one hand.
a couple of fairly good books on trapping would be "Deadfalls and Snares by AR Harding" and "Camp Life in the Woods and the Tricks of Trapping" this last title can be downloaded for free from the BCUK downloads page
unfortunately although these books are quite good they are still a little vague, I have yet to come across a really good book on traditional trap designs and there use which I could recommend to people.
many books include a section containing drawings of traps, such as the aforementioned "sas survival" and others but unfortunately many of these traps are miss-drawn and poorly explained (some of them defy physics
)
trapping is not just learning about the intricacies of trap making though, thats just scratching the surface, you can build the finest trap and it wont get you anything until you learn how to use it. Currently The only real way to learn trapping is to spend time with people who know the traps and animals of the area in which you wish to operate.
if you can get yourself to wales I am sure that either Ed or myself can teach you what you need to know for the british enviroment
