When offering cuts created a naval cut

What was the most ill-judged decision taken by a navy in roughly the last decade?

A First Sea Lord once volunteered ship cuts that the government had not planned, turning a defensive bargaining tactic into a real loss of hulls.

The example falls just outside the requested ten-year window but illustrates a costly institutional mistake. First Sea Lord Lord West offered ship cuts in an effort to protect the wider fleet. The government had not planned that particular reduction, so the offer created an opportunity to remove ships. A separate American example points to the Navy's own role in specifications that accumulate too many desired features.