The thing is that we have a society where "most" people could achieve success if they take the right path and make the right decisions. Look at all the immigrants of the 50s and 60s who came, often with nothing, but had a work and entreprenneurial ethic and whose 2nd and 3rd generations are now running huge businesses, employed at top doctors/consultants, are senior politicians, etc.
I have an entire family who are clients with varied businesses. The patriarch arrived in the 60s and started the stereotypical Asian "corner shop" run entirely by him, his wife, and his children. He ensured his children got the best education they could, made them study hard at school, go to college, etc., and they in turn started small businesses, and the cycle was repeated to the grandchildren, who all went to university, and are now my clients with numerous businesses including internet firms and property development, and are millionaires, and reinvesting their profits into businesses for their children!
We actually do have lots of opportunities in the UK, we have free education, free healthcare, generally good infrastructure, pretty easy routes to set up small businesses with low barriers to entry, etc. If there's a will, there's a way, in the UK, most people could succeed with making the right choices and decisions. (Obviously excluding those with genuine disabilities etc but even people with disabilities are often suited to being self employed!).