I'm not happy to see posters being nasty about each other's actual children. That's actually very horrible, especially if the parents are already feeling disappointed on their behalf (although mine is indeed a little madam).
Here's my position:
There's some very upset posters on here, whose children have been redirected. I think there is nothing wrong with them expressing their heartbreak and disappointment for their offspring. Let them do it if they want and don't be horrible to them. If you don't like it, don't read it.
Do not be ashamed of wanting "greatness" for your redirected child: They made it to an Oxbridge interview with the PS and grades and supra to impress, so they are indeed great(es!). Not being able to suck it up as a parent or child does not make you a snowflake; many Oxbridge candidates (and their parents) have literally spent years prepping for that day. It's a big investment you have made. Your feeling of disappointment are valid.
Choose Durham by all means, but not as an Oxbridge substitute. If you choose it because of that, you'll find that it isn't and will not appreciate its intrinsic qualities. This will prolong the pain of redirection and may induce "butt-soreness", thus diminishing your university experience
Prof Gilbert is a great example of how brains and tenacity can result in ultimate greatness, even if you have to go via Hull.
If Hull does not appeal, do not be afraid of going for something completely different, such as the USA or a completely different degree course that still requires all those A*s but has more places. Science, medicine, vet med and law and are done well all over the UK. This could mean taking a gap year, but your kids are still young. Also if you take a gap year, there is the option to re-apply if you want that gamble.
A final point that has cropped up about the interviews. It doesn't actually matter of you are "wooden" or "lack charisma" (that was really unpleasant outlier - that's her son you were talking about). They don't care how you say it or if you look at the floor (especially mathmo and natsci)