Today we lost one of our Petzl Pixa 3s somewhere between Wilson's Cave Exit and the bottom of the lane. The light might still have a feint 'C.A' marker penned on the top. If anyone finds it please drop me a message.
Yes we encountered the walking group, I imagine the light was intercepted by them as there was absolutely no sign of it when we walked back up to look soon after. Never mind. There are many worse caving mishaps to be had. Thanks for your reply.