Check your emergency contact address details written in the passport are up to date.
Contact the Passport Advice Line by calling 0300 222 0000 to find out if you need to register your new address with the passport office, as each case is different.
Get a renewal form from the Identity and Passport Service (IPS). You can do this online or you can pick up a form at your nearest post office or call the Passport Advice line and request a form by post.
Check the renewal cost and the time it will take to process your application by going to the Directgov website and selecting "Passports." There are three different types of processing for your passport. The cheapest is standard, followed by a one-week Fast Track Service, and the most expensive is a one-day Premium Service. Note that any additional time you have on your old passport will be added to your new one.