The Ivy League of the UK is the Golden Triangle (Cambridge, Oxford, LSE, KCL, UCL and Imperial). They are the leaders in research, have amongst the highest funding, have both local and foreign prestige (they lead in international rankings) and have the highest graduate starting salaries.
Durham and Warwick are hardly known outside the UK. St Andrews is not even as prestigious as Edinburgh. And Warwick is mainly only strong in Economics and Maths.