Vanguard after the Falklands as a museum ship

If HMS Vanguard survived in reserve and served in the Falklands War, how long might she remain useful?

Service could continue until roughly 1991-92, followed by preservation as a museum ship if a sufficiently large berth could be found.

In this counterfactual, a surviving Vanguard could still be useful after service in the Falklands War. The length of further service is uncertain, with 1991-92 suggested as a plausible retirement point if she remained operational. Preservation as a museum ship would then be expected. Her size would require a sufficiently large berth, leaving the eventual location open.