Cogito-
90th percentile means that 10% of working population earn a salary in excess of an MP. That's about 3 million talented, capable, intelligent, 'ordinary' working people with real lives and real world experience ...
Its interesting that you make the leap that the top 10% earners are talented, capable and intelligent.
It's a fallacy that just because you're in the top 10% earners, that means you're talented, capable and intelligent. There are too many counter-examples to mention.
It is an even greater fallacy to think that the top 10% are more 'ordinary' people with 'real lives' and 'real world experience' than the other 90%.
If the top 10% of earners fulfill this criteria, then so do the other 90%, leaving 100% of earners being 'ordinary' working people with real lives and real world experience. Clearly this is wrong.
Seeing as how poor social mobility is in the UK, and the class system is rife, it is far more likely that the top 10% earners have had a cushy life and all the advantages of growing up in an upper middle-class or upper-class household. It is less likely that they will have experienced the hardship of the remaining 90&
the sort we all say we want running the country... but who will be put off because they don't want to take a pay-cut.
We don't want people running the country because they can earn a lot of money, at least I don't, and I think many other people don't either. We want people running the country who care about making the world a fairer, more prosperous, and better place to live.