Hello maxjones45,
Thank you for using Apple Support Communities! I understand that your address and phone number have changed, and you would like to change your AutoFill information to reflect the changes on your iPad. I would be happy to help provide steps to do so.
We'll want to start by ensuring that you have updated My Card in the Contacts app with your new contact information:
Add your contact info on iPad - Apple Support
After that, follow the steps under "Fill in your contact information automatically" in the resource below to select your updated contact information:
Automatically fill in forms in Safari on iPad - Apple Support
Cheers!