In the 1980's, when Thatcher got quota's and licenses, the first thing she did was give almost 40% of them to 7 wealthy families who were fleet owners.
They promptly sold their fleets and rented out the licenses and quota's to foreign fleets.
This happened all over the country with small, medium and large fleet owners selling licenses and quota's.
The UK was the only country in the CFP to do this.
Then of course when loads of fishermen were out of work the government blamed the EU.
Also "tariff free " is meaningless; that deal hasn't been struck yet (if it ever is) and it doesn't address the masses of paper work needed.