Most definitely bookmark this site — it's the way to go for dealing with UK passport issues.
Avoid the all-day queue just to ask a question about renewing a passport or visa requirement. You can apply for the necessary application forms on this red, white, and blue site, which is super-easy to navigate and a far superior way to spend one's time.
Travel Advice gives information on visas for travellers entering the UK.
Applications and Renewals guides you through the process of first-tme applications, passports for babies and children and what to do if you need to amend your passport or it gets lost or stolen.
How to Apply lists basic details on how to fill in the forms, and where to send them.
Urgent Applications details the procedures to follow if you need a passport within 48 hrs or two weeks.
UKPA Regional Offices Locations, maps and opening times of the UKPAs regional offices.
UKPA High Street Partners is a search facility, which will locate the nearest passport agent to your home. For a small administration fee, agents (which include many post office branches) will forward your application to the relevant passport office.
Enquiries allows you to track the process of passport or other applications, or ask questions by email of a Passport Office official.
Rules and Eligibility tells you who can apply and where to do it.