question 2
Did you pay foreign tax on it?
No foreign tax paid? Treat it like any other income — employed income in the employment section, self-employed income in the self-employment section.
Foreign tax was taken? Keep your payslips and proof of tax paid. Still declare the income in its normal place, then in “Tailor your return” say Yes to the foreign section — but only to enter the foreign tax paid. HMRC then gives you Foreign Tax Credit Relief so you’re not taxed twice. Don’t enter the same income twice.
Employed by a non-UK company? You only get a PAYE reference if the employer is UK-based. No UK employer = no PAYE ref, so add the employer, declare the income and simply leave the PAYE reference box blank.