Firstly, I should say it is obviously up to DC where they apply to and where they choose to go. And our job to support.
DC is considering Oxbridge. The course is not available at all uni's and the O&C variants would be a good, although not perfect, fit - but nowhere is. The small city, slightly sheltered vibe would also suit.
Having followed the O&C threads over many years, the feeling on here seems to increasingly be that Oxbridge is something to avoided, due to huge amounts of work compared to other places, the stress that comes with this and the expectations, the difficulty of obtaining a high degree classification (combined with higher levels of blind recruitment), the lack of time for socialising etc.
DH went to Oxbridge in the 90's and simply doesn't recognise the issues with workload (non-STEM). DC also interested in non-STEM). Have things changed so much since then?