The bolded part is total rubbish. Look at the likes of Henderson, Young, Carroll, Bent, Allen, Sturridge, Adam, Crouch... Compared with the likes of Mata, Cazorla, Ba, Ramires, Hernandez, Suarez, Kagawa. It's as close to a fact as anything can be that British talent costs
far more than European talent. This is for obvious reasons that managers are hesitant as to whether a talented Spanish player could handle the Premier League, preferring a "proven" but probably more mediocre British option, as well as having the homegrown squad rules. The reason the Premier League has the highest % of foreigners is because of our monumental TV deal (which is only getting bigger over the next 18 months), which means even relegation threatened teams can pay far higher than their Spanish/Italian/German counterparts and therefore end up having a far stronger team. I'm not saying every single Spanish/Italian/German youngster would move, but money talks more often than not.
The signings of the likes of Kone (£2.5m) to Wigan and Michu to Swansea (£2m) are evidence that money talks and that a relegation threatened Premier league team can pluck the best players from mid Spanish teams quite easily if they actually take the gamble, usually at a pretty low cost. It's testament to a new breed of manager that they are actually looking at these players more seriously, rather than instead paying over the odds for homegrown talent.
Most mid-low table Spanish teams could not afford to turn down offers of up to £5m for their players (a fee which even teams newly promoted like Reading are happy to pay), as their turnover is often < £30m and their levels of debt are unbelievable, Swiss Ramble source if you're interested:
http://3.bp.blogspot.com/-LoL1aNsTa...MRSwD6Go/s640/32+RMB+La+Liga+Debt+by+Club.jpg