Singlemum

Hi, After my husband's death, I became the beneficiary of a life insurance policy in France. I received a capital sum which I declared to HMRC previous tax year and is apparently tax-free. But I continue to receive child maintenance payments, which are taxed at source in France. I periodically transfer this money to my UK bank account. 1. Do I declare this? Where on the self assessment do I mention this? 2. Do I need to use the gross amount (which due to a postal error I don't really know - can I estimate this on past taxes paid?) 3. If yes, where on the self assessment form do I mention this?