How to find Customs at London Heathrow Airport T4
When you enter or leave the UK with an ATA Carnet, you must have your Carnet processed by UK Border Force Customs.
UK Border Force at London Heathrow Terminal 4 is situated behind the check in desks on Level 2 Mezzanine between zones E and F. Look for the outsize baggage drop.
If the desk is closed, pick up the red telephone to contact a customs officer and follow their instructions
Hours of operation