You can set up your redirection online, by post, or by visiting a Post Office, up to three months in advance, so you can do it as soon as you know what day you’ll be completing. The minimum amount of notice you can give is five working days, but ideally the Royal Mail recommends you apply four weeks before to make sure that it’s in place in time.
You’ll have to be able to give both your current address and new address, including the postcodes, as well as the surnames and date of births of everyone who needs their mail redirected. If you’re married, but still receive some post in your maiden name, you’ll have to put down both surnames to make sure that all of your post gets redirected to your new address.
The easiest way to apply is online, as the registered address of the debit or credit card you use to pay for the service, is used for proof of address.