Recently there was long thread about the BCA. I can now post possible answers to some of the questions, such as "Why is the BCA still raising membership prices when there is a significant amount still left in its coffers?"
Hi
I have recently returned from a caving trip in Spain and noticed small blue circular discs a few mm thick attached near the cave number plates.
Does anyone know what they are? Are they some sort of smart marker? I have attached a photo