Quite the opposite of an improvement, but I noticed the return of a one-way system whilst I was getting the 07:40 to Peterborough this morning. Platforms 12-15 have two staircases down to them. You now have to take the staircase nearer to the Platform 16 staircase if you want to go down, and the one on Platform 12 if you want to go up. This is being enforced by an agency worker too.