Bletchleyite
Veteran Member
Who owns the new experience set? If they aren't directly connected with the production company then it may have proven more viable to create a separate set. It might also be the experience replicates the old set too much and the production company wanted an updated set.
The experience sets (there are two, one in London and one in Manchester) are owned by an independent crowdfunded business. I believe they did consider using them (and they did use the London one for the series pilot) as they are a very high quality replica, but they aren't well set up for filming (for example the top isn't open to allow camera equipment in) and they didn't want to close for long periods for filming.