FlyerTalk Forums - View Single Post - Airside Transfer T4 to T3 London Heathrow
Old Jan 21, 2010 | 11:50 pm
  #3  
Markie
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Yes you can transfer airside between T4 and T3. There is an airport bus. Just follow the signs for Connections upon arrival.

This might help:

http://www.heathrowairport.com/
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