Hi, thank you for your question. Your child maintenance liability ended when your daughter finished college, unless she went onto approved education or approved training - a list of which is here: https://www.gov.uk/child-benefit-16-19
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Thank you for your question
My name is ***** ***** I shall do my best to help you.
Sadly the news is not good.
Any payments that you have made in respect of your eldest daughter since September last year will be seen as voluntary.
That means that when the re-assessment for the younger child is made it can indeed be backdated to last October
Please ask if you need further details
You are welcome - I hope it resolves as well as possible