Thank you for posting this, Humber Transport.
As Anthony says, the map displays belong to the Community Railway Partnership. I have previously sent the CRP a photograph of the board at Barrow Haven as I believe it to be the worst along the line. The CRP have acknowledged that the design of the frames and the covers is poor. The plan is to replace all of the CRP posters along the line, along with the frames. There have been delays to this project, I am not sure of the current status. In the meantime, Northern have promised on several occasions to remove the existing boards, however as you will be aware, this has not yet been carried out. The board at Barton was, I understand, removed by the Town Council and not Northern.
I shall forward your comments on to the CRP and keep you updated as to any news of progress.
Thank you for chasing the boards. If Northern are involved then hopefully the franchise transfer doesn't delay removal pending longer term replacement.
Not number 1 priority, but hopefully at some point Network Rail can arrange for the land behind the platform up to their fence to have a strimmer give it a 'haircut'.