Does "income" for CGT as a non-resident mean "UK income" only?

The Capital Gains Tax form asks, "How much do you expect your income to be in this tax year?" and says to include your salary before tax + anything else you pay income tax on. It doesn't specify if this relates to UK taxable income only. As a non-resident with income only in Spain, do I put £0 here or do I include my pre-tax Spanish income which is only taxed in Spain?

Hi Sarah,
It will be UK income only as a non resident.
Thank you.