If I have signed into the Hornby site and click a link called Hornby Forums, I expect to be taken to the Hornby Forums, not a landing page where I see 3 of their brands and have to select Hornby a second time.
If I was signed in Airfix I see a link called Airfix Forums, and this takes you to the same landing page with 3 brands, where you need to click Airfix again to go to their forums.
It is the same if you are signed into Scalextrics too. You see a link called Scalextrics Forums, but this takes you to the landing page with 3 brands where you need to select Scalextrics again to go to their forum.
The extra step of duplicating the selection of what you want to see, is not needed because you actually need to be signed into each brand first to access their forums.
So this has introduced a usability issue due to how this was put together, compared to how it used to be. The extra brand step introduces more friction in getting to where you want to be. It is definitely worse than before.