Three of us went on a tour on a Sunday with Mike. We chose the extended tour which I highly recommend. Mike is full of knowledge and incredibly easy to listen too. He answered everyone's questions and we were a very inquisitive group! There were about 10 or so in total on the tour and 4 chose to extend. The main tour ended up taking about 2 hours, probably because of all the questions we asked, and at no point were we rushed or hurried through. The second part was a lot shorter but ticked every box we expected it too. As someone recently moved to the area I had no idea these tunnels existed and it was a real eye opener. There is parking on site and I found responses to emails and enquiries very prompt. Everyone should do it. Hopefully they will get permission to extend the tunnels at some point snd I will definitely return - maybe even to help dig