If you end up sending a group to London, here’s a helpful hint: Groups arriving at London Heathrow Airport can speed through immigration and skip the lines by heading to a dedicated area in the Immigration Arrivals Hall designated "group travel." The service is a free one offered by the U.K. Border Agency. Members of the group are processed by a dedicated Immigration Officer, who fast-tracks them through Immigration and Passport Control.
Another hint: Groups do not need to make pre-arranged requests for the service. However, it’s advised that groups of 100 or more contact the airport prior to arrival. For arrivals into Heathrow terminal three, call 011-44-208-745-6900; for terminal four, call 011-44-208-745-4700. VisitBritain offers information and planning assistance for meeting planners and group travel organizers at www.visitbritain.com/trade.