Foreign remote self-employment/agency income

I currently receive an additional income from a US-based company for which I work as an agent/contractor. I live in the UK and pay tax on my regular employment income in the UK. This foreign is not taxed in the US and a W8-BEN was completed at the commencement of the contract. I don't have a self-employed business name. How do I enter this on a self-assessment form?

Hi
You will still declare under self employment and your business name will be your own name.