Paying tax on US income.

Hello, I'm a UK resident with a PAYE job. In the 23/24 tax year I travelled to the US to deliver a keynote address at a university which was outside of my usual working role. The fee they provided was to cover my travel expenses, accommodation, and other expenses. Whatever was left over after these expenses was to be considered payment for the keynote. None of the fee was taxed in the US and none of it was transferred to a UK bank account. I've registered for self assessment and have attempted to file a return, but I'm having difficulty finding the correct way to declare this income as nothing in the "foreign" section seems to cover my situation. Any help would be greatly appreciated.

Hi ,
 

You will declare this as self employment income rather than foreign income . Thank you .