Back in 2017 the planning application for the Dart building at Parkway requested full planning permission for the non-mauve area and outline planning permission for the mauve bits including the footbridge. Could it be that the mauve bits are being funded by Railtrack as £25m seems a great deal of money for a footbridge and was more than 10% of the total budget when announced? This would make sense as the missing ground floor section is a new station building with forecourt (as seen in the artist impression) that will be used by passengers accessing and leaving the new developments being built next to the station who want to use the train. Also the drawing shows the building named as Luton Parkway Station with no mention of the word Dart, which is the same name as the station on the other side of the tracks.