You're very gracious @Piggywaspushed and I'm glad DS is upbeat about his choice, that's always a very good sign.
@crazycrofter You're DS's conundrum sounds very similar to my DS when he was deciding what to study.
None of the universities you mentioned for PPE/Economics are ranked low. They are all solid, good universities.
'Economics' can be very broad in terms of its employability both in skill and sector. I'm guessing he probably doesn't know EXACTLY what he wants to do with it yet?
Going to a 'next level up' uni like Notts or Lough to study Philosophy/theology may open doors that studying Philosophy./Theology at the aforementioned unis wouldn't (not that you've said he wants to do this). What I'm trying to say is the top employers would recruit someone from Notts. regardless of degree subject, and perhaps Loughborough too. so he could still end up in his chosen career if he takes up an offer from those two.
I'm unsure to what extent a degree from Notts/Lough will open these doors over the others......
There's also the risk of what happens in the scenario where the degree in Philosophy/Theology does not open the doors hoped for, he is now stuck with a degree he is not interested in.
You mentioned he is 'very' passionate about Economics. I don't think a BSc in Economics from Leicester, UEA etc is bad at all.
If he wants one of a higher up uni, What about the BSc in Industrial Economics at Notts? that seems less competitive and I think I've seen it in Clearing before.
Lough. has a very good Management school with various combinations of 'Management', which I feel leans more towards Economics. They do Econs & Management also, not Maths A'Level required i don't know what your DS is studying but it was one of DS2 choices (No Maths A'Level) and he got an offer.