If you fall out of eligibility for the 30 hours free childcare you will be required to pay nursery fees in full.
You can reduce your little one(s) sessions, however, as per the terms and conditions, you will need to give a full months notice to do so and therefore will still be required to pay nursery fee's in full.
If it your responsibility to keep us updated on this.
There is a grace period available from HMRC for the funding so if you fall out of funding during a "funding term" you will be funded until the start of the next funding term. For example, you fall out of funding on 5th January your little one will be funded until the end of the funding term on 31st of March.