Defiant before a British F-35 amphibious ship

Which is likely to appear first, a Defiant-class warship or a Royal Navy amphibious ship able to launch F-35Bs?

Defiant is the likelier first arrival because neither project had reached construction and the current amphibious concepts did not include F-35 operations.

Neither a Defiant-class ship nor the proposed amphibious replacement had been laid down when the question was asked. Defiant was nevertheless more likely to arrive first. The current amphibious concepts did not include F-35 operations, so such a capability would require another design change. The panel also cautions that concepts remain uncertain until contracts are placed and hulls enter construction.