If economic success is a general & continuing rise of living standards among the general population, then the last 20 years in the UK have shown the UK is *not* enjoying 'economic success':

As Marcel Liukas, observes: 'while the average Briton isn’t necessarily worse off in absolute terms than 20 years ago, many are certainly no better off. This in itself is a stark contrast to the expectation of continual improvement that characterised previous generations'

#economics
https://theconversation.com/are-britons-really-poorer-than-they-were-20-years-ago-or-does-it-just-feel-that-way-254097

Are Britons really poorer than they were 20 years ago, or does it just feel that way?

“Awful April” hasn’t helped people to feel good about their finances.

The Conversation

@ChrisMayLA6

If people who were 20 and are now 40 are no better off now that they have 20 years experience and have supposedly climbed the hierarchy of their chosen profession, I'd argue in real terms they're very much worse off!

@Pionir

yes, if we also account for reasonable aspiration(s) & expectations - which again would feed into political frustration