Where to add option exercise income

I exercised 10 stock options granted to me by my company. The strike price was £100, the UMV was £200 and I signed an s431 election to use UMV. I have therefore received (£200 - £100) x 10 = £1,000 of income on exercise. This income did not appear on my p60 and I need to put it somewhere on my tax return. Where do I put?

Hi,
This is declared on the additional information section, look for the question shares schemes, exclude amounts on your P45/P60.
If filing by paper, you need the SA101 and its on box 1 on page 2.
Thank you.