A genuine question, have you visited this winter? The original soundtrack has been restored and the bad cassette recording is finally gone.
Not to its orginal 1990 state with the corridor audio and zoned organ, but definitely to how it was at the time that video clip was recorded, the way it was in the 2000s.
If you have visited this month and think it still sounds bad, it may be more to do with the aging state of the sound system, or that it needs tweaking now that the original audio is back.
Although I still think having the same music outdoors on those PA speakers numbs the impact of hearing it the first time in the station, hopefully they will change this to an ambient track outdoors.
IPs are purely for business purposes and really nothing to do with thematic storytelling. The motorway service station type ads in Chessington's queue are super tacky, gives a really commercial impression about the park. Yuck!