Good theming/atmosphere (although not necessarily theming of the puzzles themselves) & lots of puzzle content to keep a team busy.
Had a loss of direction on a couple of occasions, especially at the beginning with working out how to proceed. Has made me appreciate other rooms where it's clear where a code goes when acquired, and also that sequence puzzles in an ideal order (frustrating to think you have unlocked a puzzle, but it eventually turns out you didn't have everything you needed to solve at the time). Still don't enjoy mathematics in any form in rooms (even with a provided calculator!).
Overall an enjoyable experience, surprisingly so given its location which seemed to cater to a younger audience (adjacent to soft-play area, climbing wall etc.). Very happy they offer a price for only 2 people, which seemed very reasonable. Go and visit if in Keswick, make sure to select the 'experienced' setting when booking.
The Curse of Old Maid Milly
Operation Sealion
Mystery Express: Snakes on a Trainunder construction
The Challenge Chambers