Booking/Reservation Websites

Travelocity
Travelocity customers can access offerings, pricing information about airlines, hotels, car rental companies, cruise lines, vacation and last-minute travel packages, and other travel-related services.
Expedia
Similar to Travelocity, Expedia is the largest online travel provider for the UK.
Lastminute
Lastminute.com is one of the UK’s leading online travel & leisure retailers. It offers flights, hotels, excursions, spas, and other travel based goods.
eBookers
An online agent, they state that it has the choice of over 250 airlines