Why San Carlos lacked barrage balloons and improvised flagships

Why were there no barrage balloons or improvised flagships at San Carlos Water?

Britain lacked ready balloons, and the war ended before improvised flagships could be prepared and deployed.

Britain did not have barrage balloons available in a deployable stock for San Carlos Water. Improvised flagships posed a different version of the same readiness problem because a suitable ship first had to be converted and equipped. The Falklands War moved too quickly for either capability to be created, prepared, and sent to the South Atlantic. A plausible idea had no operational value when the necessary equipment was not ready before the short campaign began.