Anyone spending more than about 100 days per year is classed as UK domiciled for tax purposes and is liable to UK taxation rules. NI and PAYE are applied in full for all such persons.
Just because someone has private medical insurance does not exempt them otherwise about 4 million UK taxpayers would be exempt also!
Furthermore an assuption that someone will leave the UK as soon as they have finished a contract is also flawed as many people who first visited as an overseas player subsequently make their home in the EU (eg Phil Vievers, Shane Hansen and Roberto Martinez are just some who I know are still here).
Just because someone has private medical insurance does not exempt them otherwise about 4 million UK taxpayers would be exempt also!
Furthermore an assuption that someone will leave the UK as soon as they have finished a contract is also flawed as many people who first visited as an overseas player subsequently make their home in the EU (eg Phil Vievers, Shane Hansen and Roberto Martinez are just some who I know are still here).