I've been very pleased with how will the system has been working over the past couple of years with strong and continuous use of it so thanks to everyone for continuing to support it and help keep good relations with land owners.
Some people do seem to misunderstand that this is not a permit system, and as Tim says, there is no requirement to print anything - just book online and away you go. I can appreciate why people may think this as the old system was in place for a long time and old habits die hard! If you do change your mind or plans, please remember to cancel it though.
Another thing to remember is that some caves allow more than one booking per day so you may not necessary have exclusive use. If you see another group, don't assume they haven't bothered to book. The website now shows this information when you select your cave if it applies.