Why a stronger British Empire might retain light carriers

Would a stronger British Empire retain a light-carrier line even if it also built nuclear fleet carriers?

Probably. The Invincible concept could survive, although the later light carrier would likely be larger than the historical class.

The counterfactual assumes enough imperial resources to sustain nuclear fleet carriers while keeping a separate light-carrier line. Continued demand for smaller aviation ships could preserve the role after the Centaur class. The resulting vessel would probably be larger than the historical Invincible class rather than a direct copy. It would complement the nuclear carriers as part of a broader force instead of replacing them.