Sorry Dotmania - I was absolutely responding to rabibitstew.
I agree that the lack of language skills in UK students is a problem. And I am not sure that even elite UK schools really do languages in the way that some other education systems do. GCSEs in languages seem to basically prepare you to be a tourist in another country, but certainly don't go anywhere need fluency. Children need to start languages early and teaching needs to immerse them as far as possible. Secondary schools can't really change this on their own. The whole system needs to change as secondaries take children from a mix of primaries/preps and need all of those primaries/preps to start languages differently to make a cohesive system.
I am not sure that an intellectual elite exists in the same way in the UK as it does in some other cultures. A friend from another European country described his teen years as including going to the theatre every week. I come from what might seem to be an academic/intellectual background in the UK, but we certainly didn't have that cultural upbringing.
Wordfactory is right that the most successful do have a combination of traits - "Many of them are highly intelligent, well educated, hard working and motivated as well as confident". They have that, plus open doors into all sorts of careers through networking.
What might be less visible is that there are loads of minor public schools out there which are less academically selective but getting on for as expensive as the elite academic schools. My experience of them is that they do churn out pupils with self confidence too. However many of those pupils are missing one or more of the other traits. Some are lazy, some aren't particularly intelligent (being less education might flow from either of these). The lazy generally don't get far without parental support. The less intelligent can often be quite successful in non-mainstream ways, perhaps showing entrepreneurial flair and combining this with parental capital to build up successful businesses. While they might never get into a RG university and will never end up in the political elite, their background, education and resulting confidence does bring them success that an average state school and average parents won't facility in the same way.