Hi OP. I kind of see your point about ABB offers for Politics when she's working hard to achieve all A stars.
My DD was in a similar position with a similar subject application. She didn't really want to go up north (not because of distance, more to do with her perceptions of the cold in the NE)!
She ended up applying to London unis, even though she didn't particularly want to stay in London (because we live there she didn't feel the undergrad experience would be the same).
In the end, she got into Cambridge, but her other offers were Durham (A star A,A), UCL (A star, A,A), LSE (A,A,A) and Bath (A,B,B - lower offer due to EPQ).
If she hadn't got into Cambs, she would have really struggled between LSE and Durham. LSE was second only to Cambs in the Complete Uni Guide and its a globally-renowned institution. On the other hand, Durham (despite the weather!) would have offered more if a campus-type experience and enabled her to get out if London. But it's less known overseas and, it was lower on the league table for her subject.
So what I would say is, don't get too hung up on stated uni entrance requirements. Eg. for DD, Durham was A star, A,A and LSE 'only' A,A,A, but LSE was definitely more competitive entry than Durham for this subject.
In retrospect, probably the best alternative option all round would have been Bath. Even though it is slightly lower offers for social sciences and will drop a grade again for A star in EPQ, it's still higher in the league tables than most RG unis - including Durham in many cases. It's a similar distance to Oxford or Cambridge for most in the SE and a beautiful historic town. OK, the campus is a bit 1960s, but at least it's a campus. For DD's subject these days, Bath is ahead of Durham and the usual RGs like Edinburgh, Manchester etc etc. Has she looked at Bath?
Also, Oxford make humanities offers at A,A,A, even though the reality is nearly all students actually there will have all A stars.
I have seen unis such as Exeter, state A star,A,A as entry grades for some courses - only to then be in clearing with the same course at A,A,B.
So, in summary, have a look at Bath. Also, they really don't come home that much and England is a small country - Durham is not that far. Warwick has more of a STEM reputation and (I think!) the nearest towns are Coventry or Leamington Spa - and even those are a bus ride away.