@panickyintheuk diagnostic criteria are a bit different for adults, but require symptoms to be shown before the age of 12, so it's good to see if the childhood stuff sounds like you when you were young. a major indicator is often report card comments saying 'needs to apply herself' or 'smart but disorganized' or stuff like that - I had those on every report card ever :p
here's a PDF to an adult self-assessment:
https://add.org/wp-content/uploads/2015/03/adhd-questionnaire-ASRS111.pdf