Gross tonnage can disguise a large aviation ship

How much aviation power could a cheap 12,000-GRT support ship offer a small navy in the 1970s?

Limited aviation power, with a warning that 12,000 GRT measures volume and describes a substantial ship for the period.

Gross register tonnage measures volume, so 12,000 GRT cannot be read as a displacement figure. The proposed aviation-support ship has a long flight deck but lacks armour, guns, and arresting gear. Comparing it with the Colossus class helps test whether it is actually a small vessel by the standards of the period. Its aviation value is judged limited, despite the substantial size implied by the proposal.