The two station groups don't work, I'm afraid. There are songs called Cannon Street, Victoria (and 'Euston Station', and there's probably a song called Paddington too), and Waterloo is a London terminus station in zone one with national rail services, so there are at least three valid solutions to the grid as it is.

Malcontent - thanks for your feedback. I’ve made some alterations to those two groups based on your comment. Thanks.