From a general work permit pov, then the CTA gives an opening to the UK that other EU nationals don't have (see below).
However, FIFA rules over Under-18's transferring to a foreign country override this, since as a general principle, Under-18's are not permitted to register with an Association in another Nation State. Within this, an exemption has been agreed by FIFA for transfers within EU countries, but since Brexit, EU 16 y.o. and 17 y.o. players can no longer access the UK (obv).
The rules governing this are to be found in FIFA Article 19:
file:///C:/Users/cwegr/Downloads/fifa-article-19.pdf
Note:
2. "The following [exception] to this rule applies:
a) The player’s parents move to the country in which the new club is located for reasons not linked to football."
The "not linked to football" proviso was added after clubs started "finding" jobs for the parents of promising youngsters. Although it was to circumvent FA rather than FIFA Rules, I believe that Jonny and Corry Evans were able to join Man Utd from Greenisland Boys before they were even 16, since their father was moving to England to take up a job which rather conveniently "came up" somewhere in Greater Manchester. (Loophole since closed by The FA)
Where the CTA
does confer an advantage is for ROI players who are over 18. That is, anyone from outside the UK, seeking to work in whatever occupation, including football, needs a work permit.
Within that, the four UK Football Associations have agreed a system with the Government to allocate permits to players meeting a (merit-based) points eligibility requirement. For instance, you will get a permit for a 20 y.o. Brazilian playing for Flamingo who has already a dozen full caps. Whereas a 20 y.o. Mongolian international with two dozen caps and registered with whoever the Mongolian champions are, will not qualify (Insufficient points for Mongolian football)
Under the CTA, the UK applies no such points system to ROI over-18's - if they can find a club willing to sign them, they're in.
Which to get us back to the thread title, explains why clubs like Hull or Fleetwood have been interested in linking up with LOI clubs.
See also here:
https://www.mills-reeve.com/stand-al...-youth-players