You will go through immigration/passport control at LHR but will not do customs until your final destination (Rome). Two hours should be more than enough.
How long does it take to connect through Heathrow?
Minimum connecting timesWe recommend that you allow the following times when connecting between terminals: Within Terminal 3: 60 minutes. Between Terminal 3 and Terminal 5: 90 minutes. Within Terminal 5 (UK domestic and international flights): 60 minutes.
What are the busiest hours at Heathrow?
The peak times at London Heathrow Airport is from 10 AM to 1 PM, and 5 PM to 8 PM. Since London Heathrow Airport is the busiest airport in the UK, you'll find it jam-packed with passengers 24/7.
How long does it take to get through at Heathrow?
Do I need to go through customs for a connecting flight at Heathrow?
CONNECTING FLIGHTSIf your baggage is checked through to your final destination, that's where you clear customs. If you're collecting your baggage and checking in to your next flight yourself, you need to pass through customs at Heathrow.
Do you have to go through customs when connecting through Heathrow?
CONNECTING FLIGHTSIf your baggage is checked through to your final destination, that's where you clear customs. If you're collecting your baggage and checking in to your next flight yourself, you need to pass through customs at Heathrow.
Is Heathrow always busy?
With more than 70 million passengers passing through Heathrow Airport every single day, this is an airport that is always busy. Around 1,400 flights take off and land at Heathrow Airport every day, which equates to a flight every 45 seconds and over the course of the year, this is close to half a million flights.