There's something like £15 for cleaning fee. £15 for a cleaning fee!?!?!? It's a 2m x 2m room!! How can you get off charging £15 to clean that? It's a 5 minute job!
Also, getting in is unnecessarily complicated. I've nearly finished a PhD in archaeological science but you need a PhD in cryptography to get in easily. On the plus side, fans of escape rooms may view this as an advantage.