I'm not an expert, but I've researched this a fair bit and feel like I've had some good advice, but as always take my opinion with a grain of salt
I think going to a Russell Group university, if you have the opportunity to, is only going to enhance your employability. For a start, whether we like it or not, there's a certain prestige attached to the red bricks and the Russell Group. If you're going to spend three or four years of your life studying for a piece of paper, you want the best piece of paper you can get right? Also we live in a society that, again like it or not, and for right or wrong, values status (at least in the higher echelons of business) so you're likely to find that you're going to command a better wage with more extensive opportunities if you've gotten a degree from a well respected university like that. In the past I did a foundation year at one of the East Midlands less well reputed universities, and I have to say that I don't really want to repeat the experience: it wasn't that bad but you're getting a different kind of student there. If you're serious about studying and learning, you'll find a more serious and committed kind of student at a Russell Group uni, who're there because they want to learn and not because they feel they kinda should and mum will be upset if they don't.
Check Nottingham out if you get the chance, the campus is absolutely beautiful, and the university has a sterling reputation. Nottingham ain't a bad city all in all despite what you might hear. Sheffield is also a very good university by most accounts and Sheffield is a really awesome city (it pips Nottingham by miles if you ask me).
Nottingham Trent is also a good university, it's not on quite the same level as the others you've discussed perhaps but it's one of the best ex-polytechnics in the country and it excels in the arts, so it's humanities are likely to be good too. They might be a worthwhile backup choice in case you have problems with grades (which I'm sure you won't, naturally
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