The re-ride aspect is an important one here, especially for a park who will be gaining their first proper indoor experience attraction and a company that hasn't done one on this scale (bar Legoland) and take failure far too seriously.
Rides like Tower Of Terror & Ratatouille fulfill this quite well where heavy dialogue yet variation upon ride creates these to have a high enough re-ride factor in where I could do both multiple times but still enjoy them.
Another important thing is immersion, where the experience begins when you reach the entrance plaza and finishes in the gift shop and not just the ride itself. Things like Saw do not really do this which concerns me a little here. Space nay be an issue but cattle pens don't contribute much immersion, though some rides do it better than others.
This dark ride needs to be the perfect balance of everything. A story that's immersive yet justifies re-rides (to those who aren't just enthusiasts), something popular amongst a ride that sticks out.
If this ride is done right and is hopefully s massive success, it could trigger a renaissance of UK dark rides where parks such as Towers, Drayton, Blackpool and maybe even Chessington & Paultons could invest in a new one.