First, as everyone has said, follow directions to get there. It's not a big deal if you do. Second, you need to book through 'mom'. She's a hoot.
That aside, we did the four hour tour. The price is up a bit but is worth every penny. I would do it again. Harry is very knowledgeable and cares very much for the tube environment. That's refreshening to see. The lava tube itself is full of wonder. Make sure you are with a group who move at near the same speed and with similar dexterity as yourself. There is some very basic climbing and some scree rock walking. Not a challenge, but it is there.
This trip is well worth it! Oh, and don't drink lots of coffee before the tour. There are no facilities inside.
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