Hope you don't mind me chipping in. I think in the recent two years, Durham were making offers later because in the first Covid year, they got really caught out. This is because, as goodbyestranger says, there are many courses where they will offer to pretty much anyone with grades. In the CAG year, far more actually made the required grades than their algorithm predicted (based on normal exam years) and Durham were legally obliged to squeeze them all in. That year was chaos - they had to offer students financial incentives to defer - and this meant knock-on effects for the next year. Then, on top of that, it was not CAGS, but TAGs, so more students than expected got the required grades again. They have a real accommodation shortage there, not helped by surplus students in recent years. But yes, for subjects like Sociology, they will offer to pretty much anyone with the grades, but they seem to do contextual and international offers first.
The worst for offers is LSE who for their very own reasons unbeknown to anyone else, seem to routinely keep people with three A* or more hanging until May - even for courses requiring ABB or similar. They then reject thousands on the very last day. At least with Oxbridge, everyone finds out on the same day.