@GrumpyMuleFan
There's a research report here on Foundation Years which is quite interesting.
https://www.hepi.ac.uk/wp-content/uploads/2024/03/HEPI-Report-170_Cracks-in-our-foundations_final.pdf
I don't think there's anything wrong with students targeting their preferred uni in Clearing. If you like the look of History at Southampton and you have CCC why not go? If you're not bothered by the fact most students will have higher grades than you might well be fine.
Maths I think is a bit trickier - if you're one of a few students with a B where almost everyone else has an A or an A* then it's a lot easier to see how this could be difficult.
Personally my gripe about the Russell Group is that it's a self-selecting closed shop that has ended up being presented to schools and parents as if it was some kind of "elite" and intrinsically better. And it's pretty clear that there are really no grounds for eg Southampton to be seen as any more elite than the likes of Swansea, Leicester, Reading, Sussex, Aber, Brookes etc.
I would much prefer the genuinely elite unis in the Russell Group split off to form a new group.