Doesn't matter. Britain does not have better economic mobility for the middle class. This article offers nothing of substance.
Wages have diverged further from assets (namely real estate) in the UK than in the US.
Tuitions have been going up. The quality of the healthcare system has declined.
In fact it could be argued Britain is less meritocratic, because the system holds back the working class and wage earners far more than the United States. You're taxed at excessive levels, while real estate is extraordinarily expensive.
The economic systems are the same. Just as the rest of the world you're rewarded for the assets you hold. Not the "work" you do.
For many years house prices in London increased faster than the median salary.
You made more holding real estate than working.
The United States need to fix its healthcare system immediately. It's too far drawn out and a major strain the entire economy. Then it needs to invest in infrastructure. Then reorganize its institutions, the judicial system, etc.