If you go to all the Ivy League universities’ websites to check their Study Abroad programmes, the universities all 8 of them send their students to are:
Oxford, Cambridge, LSE, UCL, KCL, Edinburgh and St Andrews.
Warwick had 2 out of 8, Exeter had 1, while Durham had zero.
All those 3 universities had far less ivies sending their students to them than to SOAS, Queen Mary, Bristol and Manchester.
So one cannot say Warwick, Exeter and even Durham have more “cachet” than KCL.
Durham is hugely popular in the UK due to its ability to attract posh kids with its Oxbridge set-up imitation, but that is really about its limit of prestige.
It is a great university to network at though and I would rate it higher than Warwick in prestige. But they are just not in the league of the Golden Triangle.