Hi happy valley. One thing that hasnt been mentioned so far is to be careful not to draw attention to any Badger setts youre watching if using torches etc, Badger baiting is still prevalent in many areas so every effort must be taken to prevent the location of setts getting in the wrong hands.
Also, many setts are regularly observed by local Badger groups, and any activity involving torches around setts may be reported to the police if observers dont know who is responsible.
Hope this doesnt sound too negative, but it was worth pointing out. I look forward to hearing of your nocturnal adventures
Mark H