That’s two contradictions; there was quite a large gap between the Class 460s leaving GatEx services and the Class 387s starting. Maybe it would be better with London to Brighton with a Class 460, Class 377 and Class 319? Or have the Class 377, 387 and 700? Or alternatively have the Class 442!
Link the Brighton Mainline to the GWE from Redhill to Reading along the North Downs Line via Dorking and Guildford. Hey presto, you now have a Mega Route.