Indefinite Leave/Remain

P408 Any individual, or relevant family member, who has applied for an extension or variation of their current immigration permission in the UK is still treated as if they have that leave. Keeping this permission applies as long as the application was made before their current permission expired. Their leave continues until the Home Office make a decision on their immigration application.

P409 An individual, or relevant family member, is considered to still have the immigration permission that they held when they made their application for an extension. Their eligibility would be based upon this status.

Hi Jackie

As far as I'm aware, they *can't* apply any sooner.

All of the Rules have bits about current visa statuses being fine, because it's not our fault (or the learner's fault!) that they can't apply any sooner.