I’m not so sure it’s Oxbridge related. Every year we have students in our office, asking about not yet receiving offers from certain Uni’s (it’s not just Durham) and you really need to enter the admission cycle of those Uni’s, on the assumption that you might not hear until very late in the cycle - however great your stats/application is. The strength of the application, just doesn’t seem to bear out any connection to the timing of the offer, unfortunately.
I think where Durham have perhaps not helped themselves this year, is introducing the new ‘college preference’ system, mid cycle. To ask applicants without an offer, to invest time & energy researching & listing 17 colleges, seems rather perverse. My niece is still waiting patiently (English), with no offer, yet spent a whole weekend ‘imagining’ herself at certain colleges and then listening on the sidelines, as others were allocated colleges last week.
The Head at my DS’s school, told the students ten days ago, that Durham had still only allocated approx 50% of offers and this does seem true within within his wider year group, particularly for certain v popular courses such as Law, History & English.
It really is difficult for them this year & it would have been better perhaps if the slower Uni’s could have helped the uncertainty by moving a bit quicker, but it seems not! Though, I suppose some Uni’s are also in a v difficult situation, whereas normally only 25% of the cohort might achieve their UCAS predictions, this year is going to be significantly higher, giving admissions a massive headache when calculating applicant/offer ratio.