1. How to get your D-U-N-S number (via Phone/PC/Laptop)
Go to Duns & Bradstreet (https://www.dnb.co.uk/) from your phone or PC
Click on 'D-U-N-S Number'
Select 'Get a D-U-N-S Number'
Select where your business operates from e.g England
Tick the appropriate answer for Companies House
Click 'Find my D-U-N-S Number'
Search either by Company Name or Company Registration Number
Then click 'Search Now'
Select your company
Then enter your first & last name and email address
Click 'Submit'
You will then get an email which you provided with your D-U-N-S Number.
On the email you will see the D-U-N-S Number. You will need this for the 'How to create an Apple Developer account' document.