Why HMS Westminster may have had only four Sea Wolf missiles available

Why might HMS Westminster have had only four Sea Wolf missiles available while operating off Libya?

It may have been a shortage at loading or a launcher fault that left only four rounds available, and the public evidence does not distinguish the two.

The reported four-missile figure has two possible explanations. HMS Westminster may have sailed with only four missiles loaded because those were the rounds available. A technical fault in the cellular launcher may instead have reduced the number of usable missiles to four during the deployment. The second explanation is considered more plausible in the discussion, but neither account receives official confirmation here.