Hi,
If you do not need to complete a Self Assessment tax return, please complete the online form P85 advising that you are still employed by your UK employer:
Get your Income Tax right if you're leaving the UK (P85)
We can arrange for your employer to stop deducting Income Tax, as you will be taxable in Egypt on this income: https://assets.publishing.service.gov.uk/media/5a80739de5274a2e87db9e3f/egypt-uk_-_in_force.pdf
You will still be required to pay class 1 National Insurance contributions. Your employer will deduct this for you.
Thank you.