Hi, long-time lurker, first-time poster. I'm Jon, the creator of Railboard. Those screenshots are actually of the Railboard iOS app, not the National Rail app.
It uses the same data feeds and is very similar to the old National Rail (here's just how similar:
https://www.railboard.com/articles/national-rail-vs-railboard). So, at first glance, it might seem like they've reintroduced the 'Earlier trains' button, but alas not.
And apologies in advance that Railboard isn't available on Android yet! I'm an iOS developer, which is why I made it for iPhone first, but making the Android version is very much the next big priority!