They ain't £2 billion any more. Building delays (imposed by politicians) & adding catapults have put that up. They should still be cheaper per ton than US carriers, but you're not comparing like with like. US shipbuilding is notoriously expensive, even compared to British yards, different propulsion, etc. A true comparison would be a 100K ton US-built nuclear carrier with a 65K ton US-built nuclear carrier.
Originally Posted by flanker30
Juris praecepta sunt haec: honeste vivere, alterum non laedere, suum cuique tribuere.