I've said it a thousand times but I'll say it again, dark rides don't have to be expensive to be good, but they need to be considered well. A simple laugh in the dark ghost train (but with better throughput than most others do) would go down a treat with Thorpe's current target audience, and they could make it scary and fun rather than spending too much money on a specific theme. If it was a large investment obviously a theme would be necessary, but then again look at the original Haunted House at Alton Towers - didn't really have one set theme, but it was fantastic!