Parking at Terminal 4 Heathrow

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Or sit and have a coffee in McDonalds on the on the A4 Bath road just outside the airport and wait for a phone call to say they are out of immigration. Then tell them to exit at passenger departure drop off, pick them up from there.

I normally tell people to call me as soon as they get of the plane and are waiting for baggage. Then by the time they get out of the airport I am normally there or thereabouts