Everyone knew it was going to happen ... THE PRICES HAVE RISEN!
It was £12.50 per person (as the bogof never went away), it is now £15.00 per person. It astounds me how many people fall for these marketing things, I hate the standard Merlin artificially inflated price to discount structure, instead of just pricing things honestly. I blame DFS.
Anyway, still think it's pretty good value for a slightly unusual experience. Do they make you wear a wetsuit? I imagine they'd be pretty rank by now!