For clarity he's never been to some of the places he's discounting. Liverpool, Birmingham, Manchester. We stayed overnight in Bristol when we went to the open day. What he means I think is that he'd rather a campus and/or small city location rather than a big, bustling city. I thought that was fairly well thought out and reasoned - he lives on the outskirts of London, goes to school in London and reasons that he will quite probably end up working in London so would like to experience something a bit different for awhile first. He's also a bit sick of the hassle he and his mates sometimes get while travelling to school, intimidation, begging, being held up at knifepoint for airpods etc and, honestly, and no offense to anyone in Bristol, we saw that element when going out for dinner in Bristol, walking around the city and doing the university tour the next day. For further clarity, he (and I) thought the course talk was also far less inspiring there than other ones we have been to too (Southampton, Bath, Bath Spa, Solent, Nottingham, Nottingham Trent) - that's what he 'hated' Bristol and likes Southampton. Realistically he can't visit too many more places before he has to submit, as its difficult getting time off school and transport at weekend, so that seems reasonable to me to concentrate on non-big city locations? Given that, as PP has said, it's a generic subject you can study at most, if not all, universities.
I think the city thing is a nice to have more though and he's concentrating on the 3 sets of leave tables more now. I'm surprised at how little correlation there is between ranking and entrance requirements, tbh, once you get away from Oxford/Warwick/UCL etc so I think he will have more choice than he initially thought.
Any more tips and thoughts very welcome.