I am blind, for some reason I've always read it as Martin Hill, thanks for noticing the small errors.OpenStreetMap suggests both St Margaret's should be with an apostrophe, and it's Martin Mill. Doubt there's space for station names given the size of the station symbols, and not really needed for showing where connections can be made. Given stations are often named after locations already marked on the map, you might be able to mark the existing names in some way?
I'll see what I can come up with with the stations.