London Heathrow Airport (IATA: LHR) is a major international airport in west London, England. Heathrow is the busiest airport in the United Kingdom and the busiest airport in Europe by passenger traffic. Heathrow is also the third busiest airport in the world by total passenger traffic. In 2014, it handled a record 73.4 million passengers, a 1.4 percent increase from 2013.
Heathrow Airport has 4 passengers terminal and a plenty of transports to London. Wikipedia
Dublin Airport provides designated set down zones for anyone wishing to drop off passengers for a flight. These zones are located outside both Terminal 1 & Terminal 2. Motorists should follow signs for T1 Departures or T2 Departures to access these set down areas. Please note for security and passenger safety unattended cars will be towed away immediately.