It seems that a new National Rail website is starting to roll out, some pages such as https://www.nationalrail.co.uk/on-the-train/ have changed over to the new design. As Great British Railways (GBR) is meant to replace the National Rail and TOC sites I thought we might have to wait for that but GBR is now "up in the air".
According to https://www.nationalrail.co.uk/national-rail-beta.aspx

According to https://www.nationalrail.co.uk/national-rail-beta.aspx
We’re just at the start of the journey to upgrade the website. The improvements won’t be happening overnight, but you might start to come across some of our new-look pages.
The full update will be revealed in stages, starting November 2022 and over the next few months.
You can look forward to a site with a clearer, modern design, making it even easier and quicker to find what you’re looking for. And there will also be better information, travel tips and inspiration for your journeys.
Whether you are using a computer, a mobile device or a tablet, it'll still be National Rail, the same trusted source for train information.
