Why HMS Ocean remained a one-ship class

Why was HMS Ocean the only ship in her class?

The Navy wanted two, but one Ocean combined with three Invincibles was expected to provide both carrier and LPH availability.

The Royal Navy wanted two ships, but funding produced only one HMS Ocean. Planners counted Ocean alongside the three Invincible-class carriers as four aviation-capable platforms. That mix was intended to leave one ship available as a carrier and another as a landing-platform helicopter ship. The Sierra Leone operation of 2001 provides an example of the structure working in practice.