ESTA
The Electronic System for Travel Authorisation website. International travellers who are seeking to travel to the United States under the Visa Waiver Program (VWP) are now subject to enhanced security requirements and will be required to pay an administrative fee. All eligible travellers who wish to travel to the U.S under the VWP must apply for authorisation.

BAA
The official site of BAA airports Ltd. With ownership of six UK airports including the largest, London Heathrow, they help millions of people every year to reach destinations all over the world.

World Clock & Weather
The site to visit for detailed information on current local times in all of the largest and most popular cities worldwide, as well as weather, sunrise & sunset times, dialling codes, airport information and more.

Air Traffic Control (ATC)
A world leader in Air Travel Management providing ATC services for aircraft flying in UK airspace and the eastern part of the North Atlantic through most of the UK's major airports, including all six BAA owned airports.

UK Air Travel Advice
The UK governments official site providing advice and assistance concerning UK air travel and transport. Including information on UK flight services, in-flight safety, luggage rules, complaints and more.

Civil Aviation Authority (CAA)
The UK's specialist aviation regulator with responsibilities including air safety, economic regulation, consumer protection, environmental research & consultancy and airspace regulation.

Foreign & Commonwealth Office (FCO)
The UK Foreign & Commonwealth Office, offering worldwide travel advice for British Nationals overseas.

Currency Convertor/Foreign Exchange
A currency and foreign exchange site featuring rate tables, travel expenses calculator, currency charts, universal currency convertor, credit card charges calculator and more.

Useful links to the NHS Travel Health information sites:
NHS Travel Immunisations
NHS Healthcare Abroad
NHS Travel Health
NHS Travel Illnesses
NHS Fit for Travel

Some suggestions for destination information, travel guides and other sites you might find useful for planning your trip:
Lonely Planet
Don't Forget Your Toothbrush
Rough Guides
Virtual Tourist
Fromners
Lets Go