I previously posted this map of King’s Cross St Pancras as part of my review of the then-new Northern Ticket Hall, but it seems relevant to the previous post.
It also seems useful to post since a video of the secrets of the Victoria line was recently posted, and it contained the (apparently little-known) fact that the best way to the platforms is definitely not to follow the signs.
If you look at the diagram, from above it’s always easier to walk to the eastern (“existing”) ticket hall, and from the Northern and Piccadilly line you should head towards the cluster of staircases where the three platforms meet.
(The image used to be hosted on TfL’s site as part of their information about the station’s upgrade, but now it’s done it’s been taken down. Instead I took this from Leewood Projects, who worked on the western ticket hall.)